211221222102020 has 144 divisors (see below), whose sum is σ = 501217392074112. Its totient is φ = 74594839587840.

The previous prime is 211221222102017. The next prime is 211221222102029. The reversal of 211221222102020 is 20201222122112.

It is a super-2 number, since 2×211221222102020² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 211221222101983 and 211221222102001.

It is not an unprimeable number, because it can be changed into a prime (211221222102029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1925020760 + ... + 1925130480.

It is an arithmetic number, because the mean of its divisors is an integer number (3480676333848).

Almost surely, 2^{211221222102020} is an apocalyptic number.

211221222102020 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 211221222102020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250608696037056).

211221222102020 is an abundant number, since it is smaller than the sum of its proper divisors (289996169972092).

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

211221222102020 is a wasteful number, since it uses less digits than its factorization.

211221222102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134542 (or 134527 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 211221222102020 its reverse (20201222122112), we get a palindrome (231422444224132).

The spelling of 211221222102020 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred two thousand, twenty".