21375015351 has 8 divisors (see below), whose sum is σ = 28793835504. Its totient is φ = 14103102720.

The previous prime is 21375015349. The next prime is 21375015377. The reversal of 21375015351 is 15351057312.

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

It is not a de Polignac number, because 21375015351 - 2¹ = 21375015349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375015341) 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, 36726540 + ... + 36727121.

It is an arithmetic number, because the mean of its divisors is an integer number (3599229438).

Almost surely, 2^21375015351 is an apocalyptic number.

21375015351 is a deficient number, since it is larger than the sum of its proper divisors (7418820153).

21375015351 is an equidigital number, since it uses as much as digits as its factorization.

21375015351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73453761.

The product of its (nonzero) digits is 15750, while the sum is 33.

The spelling of 21375015351 in words is "twenty-one billion, three hundred seventy-five million, fifteen thousand, three hundred fifty-one".