21315719630 has 32 divisors (see below), whose sum is σ = 39350361600. Its totient is φ = 8308958112.

The previous prime is 21315719609. The next prime is 21315719651. The reversal of 21315719630 is 3691751312.

It is an interprime number because it is at equal distance from previous prime (21315719609) and next prime (21315719651).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132311 + ... + 245229.

It is an arithmetic number, because the mean of its divisors is an integer number (1229698800).

Almost surely, 2^21315719630 is an apocalyptic number.

21315719630 is a deficient number, since it is larger than the sum of its proper divisors (18034641970).

21315719630 is a wasteful number, since it uses less digits than its factorization.

21315719630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113408.

The product of its (nonzero) digits is 34020, while the sum is 38.

The spelling of 21315719630 in words is "twenty-one billion, three hundred fifteen million, seven hundred nineteen thousand, six hundred thirty".