21979127337 has 8 divisors (see below), whose sum is σ = 29306963136. Its totient is φ = 14652021552.

The previous prime is 21979127327. The next prime is 21979127381. The reversal of 21979127337 is 73372197912.

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

It is not a de Polignac number, because 21979127337 - 2⁶ = 21979127273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21979127337.

It is not an unprimeable number, because it can be changed into a prime (21979127327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107893 + ... + 235794.

It is an arithmetic number, because the mean of its divisors is an integer number (3663370392).

Almost surely, 2^21979127337 is an apocalyptic number.

It is an amenable number.

21979127337 is a deficient number, since it is larger than the sum of its proper divisors (7327835799).

21979127337 is a wasteful number, since it uses less digits than its factorization.

21979127337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365007.

The product of its digits is 1000188, while the sum is 51.

The spelling of 21979127337 in words is "twenty-one billion, nine hundred seventy-nine million, one hundred twenty-seven thousand, three hundred thirty-seven".