21252106311 has 16 divisors (see below), whose sum is σ = 28790546688. Its totient is φ = 13941636800.

The previous prime is 21252106243. The next prime is 21252106319. The reversal of 21252106311 is 11360125212.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21252106311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252106319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15220 + ... + 206726.

It is an arithmetic number, because the mean of its divisors is an integer number (1799409168).

Almost surely, 2^21252106311 is an apocalyptic number.

21252106311 is a deficient number, since it is larger than the sum of its proper divisors (7538440377).

21252106311 is a wasteful number, since it uses less digits than its factorization.

21252106311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192102.

The product of its (nonzero) digits is 720, while the sum is 24.

The spelling of 21252106311 in words is "twenty-one billion, two hundred fifty-two million, one hundred six thousand, three hundred eleven".