21077375 has 16 divisors (see below), whose sum is σ = 28697760. Its totient is φ = 15328000.

The previous prime is 21077369. The next prime is 21077393. The reversal of 21077375 is 57377012.

It is not a de Polignac number, because 21077375 - 2⁴ = 21077359 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6290 + ... + 9039.

It is an arithmetic number, because the mean of its divisors is an integer number (1793610).

Almost surely, 2^21077375 is an apocalyptic number.

21077375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21077375 is a deficient number, since it is larger than the sum of its proper divisors (7620385).

21077375 is a wasteful number, since it uses less digits than its factorization.

21077375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15355 (or 15345 counting only the distinct ones).

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 21077375 is about 4591.0102374096. The cubic root of 21077375 is about 276.2308463888.

The spelling of 21077375 in words is "twenty-one million, seventy-seven thousand, three hundred seventy-five".