21196558737 has 16 divisors (see below), whose sum is σ = 31412690560. Its totient is φ = 14126367600.

The previous prime is 21196558723. The next prime is 21196558771. The reversal of 21196558737 is 73785569112.

21196558737 is a `hidden beast` number, since 2 + 1 + 19 + 6 + 558 + 73 + 7 = 666.

It is not a de Polignac number, because 21196558737 - 2⁶ = 21196558673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21196558037) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 45589 + ... + 210882.

It is an arithmetic number, because the mean of its divisors is an integer number (1963293160).

Almost surely, 2^21196558737 is an apocalyptic number.

21196558737 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21196558737 is a deficient number, since it is larger than the sum of its proper divisors (10216131823).

21196558737 is a wasteful number, since it uses less digits than its factorization.

21196558737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259541 (or 259535 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 54.

The spelling of 21196558737 in words is "twenty-one billion, one hundred ninety-six million, five hundred fifty-eight thousand, seven hundred thirty-seven".