971940421 has 4 divisors (see below), whose sum is σ = 1023095200. Its totient is φ = 920785644.

The previous prime is 971940379. The next prime is 971940451. The reversal of 971940421 is 124049179.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 971940421 - 2⁹ = 971939909 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 (971940451) 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, 25577361 + ... + 25577398.

It is an arithmetic number, because the mean of its divisors is an integer number (255773800).

Almost surely, 2^971940421 is an apocalyptic number.

It is an amenable number.

971940421 is a deficient number, since it is larger than the sum of its proper divisors (51154779).

971940421 is a wasteful number, since it uses less digits than its factorization.

971940421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51154778.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 971940421 is about 31175.9590229395. The cubic root of 971940421 is about 990.5579350035.

The spelling of 971940421 in words is "nine hundred seventy-one million, nine hundred forty thousand, four hundred twenty-one".