21550495239 has 48 divisors (see below), whose sum is σ = 38390736384. Its totient is φ = 11343931200.

The previous prime is 21550495231. The next prime is 21550495249. The reversal of 21550495239 is 93259405512.

21550495239 is a `hidden beast` number, since 2 + 1 + 550 + 4 + 95 + 2 + 3 + 9 = 666.

It is not a de Polignac number, because 21550495239 - 2³ = 21550495231 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21550495194 and 21550495203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550495231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 375334 + ... + 428924.

It is an arithmetic number, because the mean of its divisors is an integer number (799807008).

Almost surely, 2^21550495239 is an apocalyptic number.

21550495239 is a deficient number, since it is larger than the sum of its proper divisors (16840241145).

21550495239 is a wasteful number, since it uses less digits than its factorization.

21550495239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54108 (or 54105 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 45.

The spelling of 21550495239 in words is "twenty-one billion, five hundred fifty million, four hundred ninety-five thousand, two hundred thirty-nine".