21513971395 has 8 divisors (see below), whose sum is σ = 29504875104. Its totient is φ = 14752437504.

The previous prime is 21513971389. The next prime is 21513971467. The reversal of 21513971395 is 59317931512.

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

It is not a de Polignac number, because 21513971395 - 2⁵ = 21513971363 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307342414 + ... + 307342483.

It is an arithmetic number, because the mean of its divisors is an integer number (3688109388).

Almost surely, 2^21513971395 is an apocalyptic number.

21513971395 is a deficient number, since it is larger than the sum of its proper divisors (7990903709).

21513971395 is an equidigital number, since it uses as much as digits as its factorization.

21513971395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614684909.

The product of its digits is 255150, while the sum is 46.

The spelling of 21513971395 in words is "twenty-one billion, five hundred thirteen million, nine hundred seventy-one thousand, three hundred ninety-five".