21630271554 has 24 divisors (see below), whose sum is σ = 46961840640. Its totient is φ = 7195282488.

The previous prime is 21630271529. The next prime is 21630271567. The reversal of 21630271554 is 45517203612.

21630271554 is a `hidden beast` number, since 2 + 1 + 6 + 30 + 2 + 71 + 554 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1224994 + ... + 1242525.

It is an arithmetic number, because the mean of its divisors is an integer number (1956743360).

Almost surely, 2^21630271554 is an apocalyptic number.

21630271554 is an abundant number, since it is smaller than the sum of its proper divisors (25331569086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21630271554 is a wasteful number, since it uses less digits than its factorization.

21630271554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468014 (or 2468011 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 21630271554 in words is "twenty-one billion, six hundred thirty million, two hundred seventy-one thousand, five hundred fifty-four".