21630623355 has 48 divisors (see below), whose sum is σ = 42679892736. Its totient is φ = 10031588160.

The previous prime is 21630623341. The next prime is 21630623369. The reversal of 21630623355 is 55332603612.

21630623355 is a `hidden beast` number, since 2 + 16 + 306 + 2 + 335 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (21630623341) and next prime (21630623369).

It is not a de Polignac number, because 21630623355 - 2⁸ = 21630623099 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 938577 + ... + 961346.

It is an arithmetic number, because the mean of its divisors is an integer number (889164432).

Almost surely, 2^21630623355 is an apocalyptic number.

21630623355 is a deficient number, since it is larger than the sum of its proper divisors (21049269381).

21630623355 is a wasteful number, since it uses less digits than its factorization.

21630623355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899968 (or 1899965 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

The spelling of 21630623355 in words is "twenty-one billion, six hundred thirty million, six hundred twenty-three thousand, three hundred fifty-five".