21122120021012 has 24 divisors (see below), whose sum is σ = 37965841371360. Its totient is φ = 10274783571360.

The previous prime is 21122120020957. The next prime is 21122120021063. The reversal of 21122120021012 is 21012002122112.

It is a super-2 number, since 2×21122120021012² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4036562 + ... + 7651017.

It is an arithmetic number, because the mean of its divisors is an integer number (1581910057140).

Almost surely, 2^{21122120021012} is an apocalyptic number.

It is an amenable number.

21122120021012 is a deficient number, since it is larger than the sum of its proper divisors (16843721350348).

21122120021012 is a wasteful number, since it uses less digits than its factorization.

21122120021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11699831 (or 11699829 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21122120021012 its reverse (21012002122112), we get a palindrome (42134122143124).

The spelling of 21122120021012 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twenty million, twenty-one thousand, twelve".