21012102122212 has 6 divisors (see below), whose sum is σ = 36771178713878. Its totient is φ = 10506051061104.

The previous prime is 21012102122173. The next prime is 21012102122279. The reversal of 21012102122212 is 21222120121012.

It can be written as a sum of positive squares in only one way, i.e., 20467245557476 + 544856564736 = 4524074^2 + 738144^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21012102122212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626512765273 + ... + 2626512765280.

Almost surely, 2^{21012102122212} is an apocalyptic number.

It is an amenable number.

21012102122212 is a deficient number, since it is larger than the sum of its proper divisors (15759076591666).

21012102122212 is a wasteful number, since it uses less digits than its factorization.

21012102122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5253025530557 (or 5253025530555 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21012102122212 its reverse (21222120121012), we get a palindrome (42234222243224).

The spelling of 21012102122212 in words is "twenty-one trillion, twelve billion, one hundred two million, one hundred twenty-two thousand, two hundred twelve".