21012211121102 has 16 divisors (see below), whose sum is σ = 31570904238720. Its totient is φ = 10488577102848.

The previous prime is 21012211121089. The next prime is 21012211121123. The reversal of 21012211121102 is 20112111221012.

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, 68288174 + ... + 68595182.

It is an arithmetic number, because the mean of its divisors is an integer number (1973181514920).

Almost surely, 2^{21012211121102} is an apocalyptic number.

21012211121102 is a deficient number, since it is larger than the sum of its proper divisors (10558693117618).

21012211121102 is a wasteful number, since it uses less digits than its factorization.

21012211121102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363995.

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

Adding to 21012211121102 its reverse (20112111221012), we get a palindrome (41124322342114).

The spelling of 21012211121102 in words is "twenty-one trillion, twelve billion, two hundred eleven million, one hundred twenty-one thousand, one hundred two".