21121010012012 has 24 divisors (see below), whose sum is σ = 37086650707680. Its totient is φ = 10524838983680.

The previous prime is 21121010012009. The next prime is 21121010012027. The reversal of 21121010012012 is 21021001012112.

It is a super-2 number, since 2×21121010012012² (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 7 ways as a sum of consecutive naturals, for example, 3823289 + ... + 7540527.

It is an arithmetic number, because the mean of its divisors is an integer number (1545277112820).

Almost surely, 2^{21121010012012} is an apocalyptic number.

It is an amenable number.

21121010012012 is a deficient number, since it is larger than the sum of its proper divisors (15965640695668).

21121010012012 is a wasteful number, since it uses less digits than its factorization.

21121010012012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722041 (or 3722039 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21121010012012 its reverse (21021001012112), we get a palindrome (42142011024124).

It can be divided in two parts, 211210100 and 12012, that added together give a palindrome (211222112).

The spelling of 21121010012012 in words is "twenty-one trillion, one hundred twenty-one billion, ten million, twelve thousand, twelve".