21431610316 has 6 divisors (see below), whose sum is σ = 37505318060. Its totient is φ = 10715805156.

The previous prime is 21431610311. The next prime is 21431610413. The reversal of 21431610316 is 61301613412.

It is not an unprimeable number, because it can be changed into a prime (21431610311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2678951286 + ... + 2678951293.

Almost surely, 2^21431610316 is an apocalyptic number.

It is an amenable number.

21431610316 is a deficient number, since it is larger than the sum of its proper divisors (16073707744).

21431610316 is a wasteful number, since it uses less digits than its factorization.

21431610316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5357902583 (or 5357902581 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21431610316 in words is "twenty-one billion, four hundred thirty-one million, six hundred ten thousand, three hundred sixteen".