21122111201220 has 96 divisors (see below), whose sum is σ = 65945437568640. Its totient is φ = 5612659896960.

The previous prime is 21122111201209. The next prime is 21122111201239. The reversal of 21122111201220 is 2210211122112.

21122111201220 is a `hidden beast` number, since 2 + 11 + 221 + 11 + 201 + 220 = 666.

It is a super-2 number, since 2×21122111201220² (a number of 27 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 = 21122111201193 and 21122111201202.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68954991 + ... + 69260630.

It is an arithmetic number, because the mean of its divisors is an integer number (686931641340).

Almost surely, 2^{21122111201220} is an apocalyptic number.

21122111201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122111201220 is an abundant number, since it is smaller than the sum of its proper divisors (44823326367420).

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

21122111201220 is a wasteful number, since it uses less digits than its factorization.

21122111201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138215922 (or 138215914 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21122111201220 its reverse (2210211122112), we get a palindrome (23332322323332).

The spelling of 21122111201220 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred eleven million, two hundred one thousand, two hundred twenty".