21375567297 has 24 divisors (see below), whose sum is σ = 35290482240. Its totient is φ = 12213283680.

The previous prime is 21375567277. The next prime is 21375567329. The reversal of 21375567297 is 79276557312.

21375567297 is a `hidden beast` number, since 2 + 1 + 3 + 75 + 567 + 2 + 9 + 7 = 666.

It is not a de Polignac number, because 21375567297 - 2⁶ = 21375567233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21375567277) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1148647 + ... + 1167107.

It is an arithmetic number, because the mean of its divisors is an integer number (1470436760).

Almost surely, 2^21375567297 is an apocalyptic number.

It is an amenable number.

21375567297 is a deficient number, since it is larger than the sum of its proper divisors (13914914943).

21375567297 is a wasteful number, since it uses less digits than its factorization.

21375567297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36853 (or 36850 counting only the distinct ones).

The product of its digits is 5556600, while the sum is 54.

The spelling of 21375567297 in words is "twenty-one billion, three hundred seventy-five million, five hundred sixty-seven thousand, two hundred ninety-seven".