21022011212220 has 480 divisors, whose sum is σ = 67017700366848. Its totient is φ = 5515821992448.

The previous prime is 21022011212207. The next prime is 21022011212239. The reversal of 21022011212220 is 2221211022012.

It is a happy number.

21022011212220 is a `hidden beast` number, since 2 + 1 + 0 + 220 + 11 + 212 + 220 = 666.

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 = 21022011212193 and 21022011212202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 12920719047 + ... + 12920720673.

Almost surely, 2^{21022011212220} is an apocalyptic number.

21022011212220 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 21022011212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33508850183424).

21022011212220 is an abundant number, since it is smaller than the sum of its proper divisors (45995689154628).

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

21022011212220 is a wasteful number, since it uses less digits than its factorization.

21022011212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271 (or 2260 counting only the distinct ones).

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

Adding to 21022011212220 its reverse (2221211022012), we get a palindrome (23243222234232).

The spelling of 21022011212220 in words is "twenty-one trillion, twenty-two billion, eleven million, two hundred twelve thousand, two hundred twenty".