21550631301 has 12 divisors (see below), whose sum is σ = 31241071212. Its totient is φ = 14315219136.

The previous prime is 21550631251. The next prime is 21550631303. The reversal of 21550631301 is 10313605512.

21550631301 is a `hidden beast` number, since 21 + 5 + 5 + 0 + 631 + 3 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6007025025 + 15543606276 = 77505^2 + 124674^2 .

It is not a de Polignac number, because 21550631301 - 2⁷ = 21550631173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550631303) by changing a digit.

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, 4319736 + ... + 4324721.

It is an arithmetic number, because the mean of its divisors is an integer number (2603422601).

Almost surely, 2^21550631301 is an apocalyptic number.

It is an amenable number.

21550631301 is a deficient number, since it is larger than the sum of its proper divisors (9690439911).

21550631301 is a wasteful number, since it uses less digits than its factorization.

21550631301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8644740 (or 8644737 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The spelling of 21550631301 in words is "twenty-one billion, five hundred fifty million, six hundred thirty-one thousand, three hundred one".