21374831 has 8 divisors (see below), whose sum is σ = 22770720. Its totient is φ = 19994368.

The previous prime is 21374819. The next prime is 21374849. The reversal of 21374831 is 13847312.

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 21374831 - 2⁶ = 21374767 is a prime.

It is a super-2 number, since 2×21374831² = 913766800557122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21374794 and 21374803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374851) 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, 926 + ... + 6603.

It is an arithmetic number, because the mean of its divisors is an integer number (2846340).

Almost surely, 2^21374831 is an apocalyptic number.

21374831 is a deficient number, since it is larger than the sum of its proper divisors (1395889).

21374831 is a wasteful number, since it uses less digits than its factorization.

21374831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7713.

The product of its digits is 4032, while the sum is 29.

The square root of 21374831 is about 4623.2922252438. The cubic root of 21374831 is about 277.5242237329.

The spelling of 21374831 in words is "twenty-one million, three hundred seventy-four thousand, eight hundred thirty-one".