21257379958 has 8 divisors (see below), whose sum is σ = 32985589680. Its totient is φ = 10262183400.

The previous prime is 21257379937. The next prime is 21257380013. The reversal of 21257379958 is 85997375212.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (58), and also a Moran number because the ratio is a prime number: 366506551 = 21257379958 / (2 + 1 + 2 + 5 + 7 + 3 + 7 + 9 + 9 + 5 + 8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183253218 + ... + 183253333.

It is an arithmetic number, because the mean of its divisors is an integer number (4123198710).

Almost surely, 2^21257379958 is an apocalyptic number.

21257379958 is a deficient number, since it is larger than the sum of its proper divisors (11728209722).

21257379958 is a wasteful number, since it uses less digits than its factorization.

21257379958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366506582.

The product of its digits is 9525600, while the sum is 58.

The spelling of 21257379958 in words is "twenty-one billion, two hundred fifty-seven million, three hundred seventy-nine thousand, nine hundred fifty-eight".