21231516246 has 16 divisors (see below), whose sum is σ = 44309251584. Its totient is φ = 6769468904.

The previous prime is 21231516193. The next prime is 21231516247. The reversal of 21231516246 is 64261513212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231516247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76925646 + ... + 76925921.

It is an arithmetic number, because the mean of its divisors is an integer number (2769328224).

Almost surely, 2^21231516246 is an apocalyptic number.

21231516246 is an abundant number, since it is smaller than the sum of its proper divisors (23077735338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21231516246 is a wasteful number, since it uses less digits than its factorization.

21231516246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153851595.

The product of its digits is 17280, while the sum is 33.

The spelling of 21231516246 in words is "twenty-one billion, two hundred thirty-one million, five hundred sixteen thousand, two hundred forty-six".