21062651231 has 4 divisors (see below), whose sum is σ = 21065373600. Its totient is φ = 21059928864.

The previous prime is 21062651219. The next prime is 21062651261. The reversal of 21062651231 is 13215626012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21062651231 - 2¹⁴ = 21062634847 is a prime.

It is a super-2 number, since 2×21062651231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21062651194 and 21062651203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21062651261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1349546 + ... + 1365063.

It is an arithmetic number, because the mean of its divisors is an integer number (5266343400).

Almost surely, 2^21062651231 is an apocalyptic number.

21062651231 is a deficient number, since it is larger than the sum of its proper divisors (2722369).

21062651231 is an equidigital number, since it uses as much as digits as its factorization.

21062651231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722368.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21062651231 in words is "twenty-one billion, sixty-two million, six hundred fifty-one thousand, two hundred thirty-one".