21970346 has 8 divisors (see below), whose sum is σ = 34690080. Its totient is φ = 10406988.

The previous prime is 21970339. The next prime is 21970363. The reversal of 21970346 is 64307912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21970346² = 965392206719432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289046 + ... + 289121.

It is an arithmetic number, because the mean of its divisors is an integer number (4336260).

Almost surely, 2^21970346 is an apocalyptic number.

21970346 is a deficient number, since it is larger than the sum of its proper divisors (12719734).

21970346 is a wasteful number, since it uses less digits than its factorization.

21970346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578188.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 21970346 is about 4687.2535668555. The cubic root of 21970346 is about 280.0779799812.

The spelling of 21970346 in words is "twenty-one million, nine hundred seventy thousand, three hundred forty-six".