21221011122012 has 54 divisors (see below), whose sum is σ = 58085716357032. Its totient is φ = 6529541881824.

The previous prime is 21221011121993. The next prime is 21221011122019. The reversal of 21221011122012 is 21022111012212.

21221011122012 is a `hidden beast` number, since 212 + 210 + 1 + 11 + 220 + 12 = 666.

It is a super-3 number, since 3×21221011122012³ (a number of 41 digits) contains 333 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221011122019) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1743995488 + ... + 1744007655.

Almost surely, 2^{21221011122012} is an apocalyptic number.

It is an amenable number.

21221011122012 is an abundant number, since it is smaller than the sum of its proper divisors (36864705235020).

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

21221011122012 is a wasteful number, since it uses less digits than its factorization.

21221011122012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3488003179 (or 3488003161 counting only the distinct ones).

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

Adding to 21221011122012 its reverse (21022111012212), we get a palindrome (42243122134224).

The spelling of 21221011122012 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, one hundred twenty-two thousand, twelve".