21234662231 has 16 divisors (see below), whose sum is σ = 21846982080. Its totient is φ = 20627066880.

The previous prime is 21234662227. The next prime is 21234662299. The reversal of 21234662231 is 13226643212.

It is a cyclic number.

It is not a de Polignac number, because 21234662231 - 2² = 21234662227 is a prime.

It is a super-2 number, since 2×21234662231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234662221) 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, 12112451 + ... + 12114203.

It is an arithmetic number, because the mean of its divisors is an integer number (1365436380).

Almost surely, 2^21234662231 is an apocalyptic number.

21234662231 is a deficient number, since it is larger than the sum of its proper divisors (612319849).

21234662231 is a wasteful number, since it uses less digits than its factorization.

21234662231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906.

The product of its digits is 20736, while the sum is 32.

The spelling of 21234662231 in words is "twenty-one billion, two hundred thirty-four million, six hundred sixty-two thousand, two hundred thirty-one".