21655012630 has 8 divisors (see below), whose sum is σ = 38979022752. Its totient is φ = 8662005048.

The previous prime is 21655012609. The next prime is 21655012651. The reversal of 21655012630 is 3621055612.

It is an interprime number because it is at equal distance from previous prime (21655012609) and next prime (21655012651).

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

It is a junction number, because it is equal to n+sod(n) for n = 21655012592 and 21655012601.

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, 1082750622 + ... + 1082750641.

It is an arithmetic number, because the mean of its divisors is an integer number (4872377844).

Almost surely, 2^21655012630 is an apocalyptic number.

21655012630 is a deficient number, since it is larger than the sum of its proper divisors (17324010122).

21655012630 is a wasteful number, since it uses less digits than its factorization.

21655012630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165501270.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 21655012630 in words is "twenty-one billion, six hundred fifty-five million, twelve thousand, six hundred thirty".