21970323 has 12 divisors (see below), whose sum is σ = 31912608. Its totient is φ = 14564880.

The previous prime is 21970303. The next prime is 21970339. The reversal of 21970323 is 32307912.

It is not a de Polignac number, because 21970323 - 2⁹ = 21969811 is a prime.

It is a super-4 number, since 4×21970323⁴ (a number of 30 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21970303) 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, 5115 + ... + 8372.

It is an arithmetic number, because the mean of its divisors is an integer number (2659384).

Almost surely, 2^21970323 is an apocalyptic number.

21970323 is a deficient number, since it is larger than the sum of its proper divisors (9942285).

21970323 is a wasteful number, since it uses less digits than its factorization.

21970323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13674 (or 13671 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 21970323 is about 4687.2511133926. The cubic root of 21970323 is about 280.0778822465.

The spelling of 21970323 in words is "twenty-one million, nine hundred seventy thousand, three hundred twenty-three".