21012102122102 has 16 divisors (see below), whose sum is σ = 38791573148832. Its totient is φ = 8312479960320.

The previous prime is 21012102122093. The next prime is 21012102122149. The reversal of 21012102122102 is 20122120121012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57725555099 + ... + 57725555462.

It is an arithmetic number, because the mean of its divisors is an integer number (2424473321802).

Almost surely, 2^{21012102122102} is an apocalyptic number.

21012102122102 is a deficient number, since it is larger than the sum of its proper divisors (17779471026730).

21012102122102 is a wasteful number, since it uses less digits than its factorization.

21012102122102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115451110583.

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

Adding to 21012102122102 its reverse (20122120121012), we get a palindrome (41134222243114).

The spelling of 21012102122102 in words is "twenty-one trillion, twelve billion, one hundred two million, one hundred twenty-two thousand, one hundred two".