21377294 has 4 divisors (see below), whose sum is σ = 32065944. Its totient is φ = 10688646.

The previous prime is 21377269. The next prime is 21377303. The reversal of 21377294 is 49277312.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5344322 + ... + 5344325.

It is an arithmetic number, because the mean of its divisors is an integer number (8016486).

Almost surely, 2^21377294 is an apocalyptic number.

21377294 is a deficient number, since it is larger than the sum of its proper divisors (10688650).

21377294 is a wasteful number, since it uses less digits than its factorization.

21377294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10688649.

The product of its digits is 21168, while the sum is 35.

The square root of 21377294 is about 4623.5585861974. The cubic root of 21377294 is about 277.5348829346.

The spelling of 21377294 in words is "twenty-one million, three hundred seventy-seven thousand, two hundred ninety-four".