21217152112 has 40 divisors (see below), whose sum is σ = 44386159104. Its totient is φ = 9766927104.

The previous prime is 21217152101. The next prime is 21217152133. The reversal of 21217152112 is 21125171212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53503 + ... + 212830.

Almost surely, 2^21217152112 is an apocalyptic number.

It is an amenable number.

21217152112 is an abundant number, since it is smaller than the sum of its proper divisors (23169006992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21217152112 is a wasteful number, since it uses less digits than its factorization.

21217152112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266737 (or 266731 counting only the distinct ones).

The product of its digits is 560, while the sum is 25.

The spelling of 21217152112 in words is "twenty-one billion, two hundred seventeen million, one hundred fifty-two thousand, one hundred twelve".