21523174347 has 8 divisors (see below), whose sum is σ = 29945286144. Its totient is φ = 13724922728.

The previous prime is 21523174339. The next prime is 21523174349. The reversal of 21523174347 is 74347132512.

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 21523174347 - 2³ = 21523174339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21523174349) 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, 155964963 + ... + 155965100.

It is an arithmetic number, because the mean of its divisors is an integer number (3743160768).

Almost surely, 2^21523174347 is an apocalyptic number.

21523174347 is a deficient number, since it is larger than the sum of its proper divisors (8422111797).

21523174347 is a wasteful number, since it uses less digits than its factorization.

21523174347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311930089.

The product of its digits is 141120, while the sum is 39.

The spelling of 21523174347 in words is "twenty-one billion, five hundred twenty-three million, one hundred seventy-four thousand, three hundred forty-seven".