21671683502 has 8 divisors (see below), whose sum is σ = 37151457456. Its totient is φ = 9287864352.

The previous prime is 21671683493. The next prime is 21671683511. The reversal of 21671683502 is 20538617612.

It is an interprime number because it is at equal distance from previous prime (21671683493) and next prime (21671683511).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21671683502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773988683 + ... + 773988710.

It is an arithmetic number, because the mean of its divisors is an integer number (4643932182).

Almost surely, 2^21671683502 is an apocalyptic number.

21671683502 is a deficient number, since it is larger than the sum of its proper divisors (15479773954).

21671683502 is a wasteful number, since it uses less digits than its factorization.

21671683502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547977402.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 21671683502 in words is "twenty-one billion, six hundred seventy-one million, six hundred eighty-three thousand, five hundred two".