21231645296 has 10 divisors (see below), whose sum is σ = 41136312792. Its totient is φ = 10615822640.

The previous prime is 21231645269. The next prime is 21231645301. The reversal of 21231645296 is 69254613212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663488900 + ... + 663488931.

Almost surely, 2^21231645296 is an apocalyptic number.

It is an amenable number.

21231645296 is a deficient number, since it is larger than the sum of its proper divisors (19904667496).

21231645296 is a wasteful number, since it uses less digits than its factorization.

21231645296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326977839 (or 1326977833 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The spelling of 21231645296 in words is "twenty-one billion, two hundred thirty-one million, six hundred forty-five thousand, two hundred ninety-six".