21122220012120 has 96 divisors (see below), whose sum is σ = 68647989075120. Its totient is φ = 5632528492800.

The previous prime is 21122220012079. The next prime is 21122220012133. The reversal of 21122220012120 is 2121002222112.

It is a happy number.

21122220012120 is a `hidden beast` number, since 211 + 22 + 220 + 0 + 1 + 212 + 0 = 666.

It is a super-2 number, since 2×21122220012120² (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 = 21122220012093 and 21122220012102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37708095 + ... + 38264145.

Almost surely, 2^{21122220012120} is an apocalyptic number.

21122220012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122220012120 is an abundant number, since it is smaller than the sum of its proper divisors (47525769063000).

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

21122220012120 is a wasteful number, since it uses less digits than its factorization.

21122220012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661585 (or 661578 counting only the distinct ones).

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

Adding to 21122220012120 its reverse (2121002222112), we get a palindrome (23243222234232).

The spelling of 21122220012120 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty million, twelve thousand, one hundred twenty".