21474346 has 4 divisors (see below), whose sum is σ = 32211522. Its totient is φ = 10737172.

The previous prime is 21474293. The next prime is 21474353. The reversal of 21474346 is 64347412.

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

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 2595321 = 4345^2 + 1611^2 .

It is a super-2 number, since 2×21474346² = 922295072255432, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5368585 + ... + 5368588.

Almost surely, 2^21474346 is an apocalyptic number.

21474346 is a deficient number, since it is larger than the sum of its proper divisors (10737176).

21474346 is a wasteful number, since it uses less digits than its factorization.

21474346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10737175.

The product of its digits is 16128, while the sum is 31.

The square root of 21474346 is about 4634.0420800852. The cubic root of 21474346 is about 277.9542477715.

The spelling of 21474346 in words is "twenty-one million, four hundred seventy-four thousand, three hundred forty-six".