972699021 has 12 divisors (see below), whose sum is σ = 1605725472. Its totient is φ = 555827976.

The previous prime is 972699019. The next prime is 972699043. The reversal of 972699021 is 120996279.

It is not a de Polignac number, because 972699021 - 2¹ = 972699019 is a prime.

It is a super-2 number, since 2×972699021² = 1892286770908716882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (972699011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7719771 + ... + 7719896.

It is an arithmetic number, because the mean of its divisors is an integer number (133810456).

Almost surely, 2^972699021 is an apocalyptic number.

It is an amenable number.

972699021 is a deficient number, since it is larger than the sum of its proper divisors (633026451).

972699021 is a wasteful number, since it uses less digits than its factorization.

972699021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15439680 (or 15439677 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 972699021 is about 31188.1230759403. The cubic root of 972699021 is about 990.8155783113.

The spelling of 972699021 in words is "nine hundred seventy-two million, six hundred ninety-nine thousand, twenty-one".