21179837975 has 6 divisors (see below), whose sum is σ = 26262999120. Its totient is φ = 16943870360.

The previous prime is 21179837971. The next prime is 21179837981. The reversal of 21179837975 is 57973897112.

It is not a de Polignac number, because 21179837975 - 2² = 21179837971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21179837971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 423596735 + ... + 423596784.

It is an arithmetic number, because the mean of its divisors is an integer number (4377166520).

Almost surely, 2^21179837975 is an apocalyptic number.

21179837975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21179837975 is a deficient number, since it is larger than the sum of its proper divisors (5083161145).

21179837975 is an equidigital number, since it uses as much as digits as its factorization.

21179837975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847193529 (or 847193524 counting only the distinct ones).

The product of its digits is 6667920, while the sum is 59.

The spelling of 21179837975 in words is "twenty-one billion, one hundred seventy-nine million, eight hundred thirty-seven thousand, nine hundred seventy-five".