21220012111012 has 96 divisors (see below), whose sum is σ = 44126046518400. Its totient is φ = 8801955456000.

The previous prime is 21220012110961. The next prime is 21220012111021. The reversal of 21220012111012 is 21011121002212.

It is a super-2 number, since 2×21220012111012² (a number of 27 digits) contains 22 as substring.

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, 37793064 + ... + 38350432.

It is an arithmetic number, because the mean of its divisors is an integer number (459646317900).

Almost surely, 2^{21220012111012} is an apocalyptic number.

21220012111012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21220012111012 is an abundant number, since it is smaller than the sum of its proper divisors (22906034407388).

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

21220012111012 is a wasteful number, since it uses less digits than its factorization.

21220012111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558157 (or 558155 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21220012111012 its reverse (21011121002212), we get a palindrome (42231133113224).

The spelling of 21220012111012 in words is "twenty-one trillion, two hundred twenty billion, twelve million, one hundred eleven thousand, twelve".