21377086 has 4 divisors (see below), whose sum is σ = 32065632. Its totient is φ = 10688542.

The previous prime is 21377077. The next prime is 21377093. The reversal of 21377086 is 68077312.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5344270 + ... + 5344273.

It is an arithmetic number, because the mean of its divisors is an integer number (8016408).

Almost surely, 2^21377086 is an apocalyptic number.

21377086 is a deficient number, since it is larger than the sum of its proper divisors (10688546).

21377086 is a wasteful number, since it uses less digits than its factorization.

21377086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10688545.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 21377086 is about 4623.5360926460. The cubic root of 21377086 is about 277.5339827982.

The spelling of 21377086 in words is "twenty-one million, three hundred seventy-seven thousand, eighty-six".