21102021111012 has 48 divisors (see below), whose sum is σ = 50625099297024. Its totient is φ = 6837123168000.

The previous prime is 21102021111011. The next prime is 21102021111037. The reversal of 21102021111012 is 21011112020112.

It is a happy number.

It is a super-2 number, since 2×21102021111012² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21102021110982 and 21102021111000.

It is not an unprimeable number, because it can be changed into a prime (21102021111011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79000039 + ... + 79266702.

It is an arithmetic number, because the mean of its divisors is an integer number (1054689568688).

Almost surely, 2^{21102021111012} is an apocalyptic number.

It is an amenable number.

21102021111012 is an abundant number, since it is smaller than the sum of its proper divisors (29523078186012).

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

21102021111012 is a wasteful number, since it uses less digits than its factorization.

21102021111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158267060 (or 158267058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21102021111012 its reverse (21011112020112), we get a palindrome (42113133131124).

The spelling of 21102021111012 in words is "twenty-one trillion, one hundred two billion, twenty-one million, one hundred eleven thousand, twelve".