21192028315 has 8 divisors (see below), whose sum is σ = 25431693120. Its totient is φ = 16952783232.

The previous prime is 21192028303. The next prime is 21192028357. The reversal of 21192028315 is 51382029112.

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

It is a cyclic number.

It is not a de Polignac number, because 21192028315 - 2⁹ = 21192027803 is a prime.

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, 19587 + ... + 206803.

It is an arithmetic number, because the mean of its divisors is an integer number (3178961640).

Almost surely, 2^21192028315 is an apocalyptic number.

21192028315 is a deficient number, since it is larger than the sum of its proper divisors (4239664805).

21192028315 is a wasteful number, since it uses less digits than its factorization.

21192028315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209861.

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 21192028315 in words is "twenty-one billion, one hundred ninety-two million, twenty-eight thousand, three hundred fifteen".