21631855514 has 8 divisors (see below), whose sum is σ = 32448977460. Its totient is φ = 10815529696.

The previous prime is 21631855477. The next prime is 21631855543. The reversal of 21631855514 is 41555813612.

It can be written as a sum of positive squares in 2 ways, for example, as 17091117289 + 4540738225 = 130733^2 + 67385^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125699 + ... + 243030.

Almost surely, 2^21631855514 is an apocalyptic number.

21631855514 is a deficient number, since it is larger than the sum of its proper divisors (10817121946).

21631855514 is a wasteful number, since it uses less digits than its factorization.

21631855514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398064.

The product of its digits is 144000, while the sum is 41.

The spelling of 21631855514 in words is "twenty-one billion, six hundred thirty-one million, eight hundred fifty-five thousand, five hundred fourteen".