21112101122212 has 6 divisors (see below), whose sum is σ = 36946176963878. Its totient is φ = 10556050561104.

The previous prime is 21112101122153. The next prime is 21112101122237. The reversal of 21112101122212 is 21222110121112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18007682654116 + 3104418468096 = 4243546^2 + 1761936^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21112101122212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639012640273 + ... + 2639012640280.

Almost surely, 2^{21112101122212} is an apocalyptic number.

It is an amenable number.

21112101122212 is a deficient number, since it is larger than the sum of its proper divisors (15834075841666).

21112101122212 is a wasteful number, since it uses less digits than its factorization.

21112101122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278025280557 (or 5278025280555 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21112101122212 its reverse (21222110121112), we get a palindrome (42334211243324).

The spelling of 21112101122212 in words is "twenty-one trillion, one hundred twelve billion, one hundred one million, one hundred twenty-two thousand, two hundred twelve".