21147295215 has 16 divisors (see below), whose sum is σ = 33837536736. Its totient is φ = 11277936000.

The previous prime is 21147295207. The next prime is 21147295219. The reversal of 21147295215 is 51259274112.

It is not a de Polignac number, because 21147295215 - 2³ = 21147295207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147295219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409125 + ... + 457905.

It is an arithmetic number, because the mean of its divisors is an integer number (2114846046).

Almost surely, 2^21147295215 is an apocalyptic number.

21147295215 is a deficient number, since it is larger than the sum of its proper divisors (12690241521).

21147295215 is a wasteful number, since it uses less digits than its factorization.

21147295215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77690.

The product of its digits is 50400, while the sum is 39.

The spelling of 21147295215 in words is "twenty-one billion, one hundred forty-seven million, two hundred ninety-five thousand, two hundred fifteen".