211222101220020 has 288 divisors, whose sum is σ = 707457418536960. Its totient is φ = 50583393146880.

The previous prime is 211222101220007. The next prime is 211222101220069. The reversal of 211222101220020 is 20022101222112.

It is a happy number.

211222101220020 is a `hidden beast` number, since 211 + 2 + 2 + 210 + 1 + 220 + 0 + 20 = 666.

It is a super-2 number, since 2×211222101220020² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 211222101219975 and 211222101220002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 190999794 + ... + 192102486.

It is an arithmetic number, because the mean of its divisors is an integer number (2456449369920).

Almost surely, 2^{211222101220020} is an apocalyptic number.

211222101220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211222101220020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (353728709268480).

211222101220020 is an abundant number, since it is smaller than the sum of its proper divisors (496235317316940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211222101220020 is a wasteful number, since it uses less digits than its factorization.

211222101220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103895 (or 1103890 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 211222101220020 its reverse (20022101222112), we get a palindrome (231244202442132).

The spelling of 211222101220020 in words is "two hundred eleven trillion, two hundred twenty-two billion, one hundred one million, two hundred twenty thousand, twenty".