21377606 has 4 divisors (see below), whose sum is σ = 32066412. Its totient is φ = 10688802.

The previous prime is 21377599. The next prime is 21377627. The reversal of 21377606 is 60677312.

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

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, 5344400 + ... + 5344403.

It is an arithmetic number, because the mean of its divisors is an integer number (8016603).

Almost surely, 2^21377606 is an apocalyptic number.

21377606 is a deficient number, since it is larger than the sum of its proper divisors (10688806).

21377606 is a wasteful number, since it uses less digits than its factorization.

21377606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10688805.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 21377606 is about 4623.5923263194. The cubic root of 21377606 is about 277.5362331283.

The spelling of 21377606 in words is "twenty-one million, three hundred seventy-seven thousand, six hundred six".