21102121011212 has 24 divisors (see below), whose sum is σ = 36996424012800. Its totient is φ = 10531720613520.

The previous prime is 21102121011173. The next prime is 21102121011271. The reversal of 21102121011212 is 21211012120112.

It is a super-2 number, since 2×21102121011212² (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, 12303887 + ... + 13913657.

It is an arithmetic number, because the mean of its divisors is an integer number (1541517667200).

Almost surely, 2^{21102121011212} is an apocalyptic number.

It is an amenable number.

21102121011212 is a deficient number, since it is larger than the sum of its proper divisors (15894303001588).

21102121011212 is a wasteful number, since it uses less digits than its factorization.

21102121011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615781 (or 1615779 counting only the distinct ones).

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

Adding to 21102121011212 its reverse (21211012120112), we get a palindrome (42313133131324).

The spelling of 21102121011212 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-one million, eleven thousand, two hundred twelve".