21221012111012 has 12 divisors (see below), whose sum is σ = 42442024222080. Its totient is φ = 9094719476136.

The previous prime is 21221012110999. The next prime is 21221012111027. The reversal of 21221012111012 is 21011121012212.

21221012111012 is an admirable number.

It is a super-2 number, since 2×21221012111012² (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 3 ways as a sum of consecutive naturals, for example, 378946644812 + ... + 378946644867.

It is an arithmetic number, because the mean of its divisors is an integer number (3536835351840).

Almost surely, 2^{21221012111012} is an apocalyptic number.

It is an amenable number.

21221012111012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21221012111012 is a wasteful number, since it uses less digits than its factorization.

21221012111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757893289690 (or 757893289688 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21221012111012 its reverse (21011121012212), we get a palindrome (42232133123224).

The spelling of 21221012111012 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, one hundred eleven thousand, twelve".