971353021 has 4 divisors (see below), whose sum is σ = 1028491452. Its totient is φ = 914214592.

The previous prime is 971352973. The next prime is 971353037. The reversal of 971353021 is 120353179.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 875508921 + 95844100 = 29589^2 + 9790^2 .

It is a cyclic number.

It is not a de Polignac number, because 971353021 - 2²⁷ = 837135293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971353091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28569190 + ... + 28569223.

It is an arithmetic number, because the mean of its divisors is an integer number (257122863).

Almost surely, 2^971353021 is an apocalyptic number.

It is an amenable number.

971353021 is a deficient number, since it is larger than the sum of its proper divisors (57138431).

971353021 is a wasteful number, since it uses less digits than its factorization.

971353021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57138430.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 971353021 is about 31166.5368785176. The cubic root of 971353021 is about 990.3583442419.

The spelling of 971353021 in words is "nine hundred seventy-one million, three hundred fifty-three thousand, twenty-one".