21231643462 has 16 divisors (see below), whose sum is σ = 31921280784. Its totient is φ = 10591236000.

The previous prime is 21231643453. The next prime is 21231643487. The reversal of 21231643462 is 26434613212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3644512 + ... + 3650332.

It is an arithmetic number, because the mean of its divisors is an integer number (1995080049).

Almost surely, 2^21231643462 is an apocalyptic number.

21231643462 is a deficient number, since it is larger than the sum of its proper divisors (10689637322).

21231643462 is a wasteful number, since it uses less digits than its factorization.

21231643462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9735.

The product of its digits is 41472, while the sum is 34.

The spelling of 21231643462 in words is "twenty-one billion, two hundred thirty-one million, six hundred forty-three thousand, four hundred sixty-two".