21293674 has 4 divisors (see below), whose sum is σ = 31940514. Its totient is φ = 10646836.

The previous prime is 21293663. The next prime is 21293693. The reversal of 21293674 is 47639212.

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., 21095649 + 198025 = 4593^2 + 445^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5323417 + ... + 5323420.

Almost surely, 2^21293674 is an apocalyptic number.

21293674 is a deficient number, since it is larger than the sum of its proper divisors (10646840).

21293674 is a wasteful number, since it uses less digits than its factorization.

21293674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10646839.

The product of its digits is 18144, while the sum is 34.

The square root of 21293674 is about 4614.5069075688. The cubic root of 21293674 is about 277.1725390930.

The spelling of 21293674 in words is "twenty-one million, two hundred ninety-three thousand, six hundred seventy-four".