21321974597 has 8 divisors (see below), whose sum is σ = 26583241152. Its totient is φ = 16614525600.

The previous prime is 21321974593. The next prime is 21321974647. The reversal of 21321974597 is 79547912312.

It is a happy number.

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 21321974597 - 2² = 21321974593 is a prime.

It is a super-2 number, since 2×21321974597² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321974593) 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, 138454304 + ... + 138454457.

It is an arithmetic number, because the mean of its divisors is an integer number (3322905144).

Almost surely, 2^21321974597 is an apocalyptic number.

It is an amenable number.

21321974597 is a deficient number, since it is larger than the sum of its proper divisors (5261266555).

21321974597 is a wasteful number, since it uses less digits than its factorization.

21321974597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276908779.

The product of its digits is 952560, while the sum is 50.

The spelling of 21321974597 in words is "twenty-one billion, three hundred twenty-one million, nine hundred seventy-four thousand, five hundred ninety-seven".