21377075 has 24 divisors (see below), whose sum is σ = 28324080. Its totient is φ = 15948800.

The previous prime is 21377039. The next prime is 21377077. The reversal of 21377075 is 57077312.

It is not a de Polignac number, because 21377075 - 2¹⁰ = 21376051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21377077) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75935 + ... + 76215.

It is an arithmetic number, because the mean of its divisors is an integer number (1180170).

Almost surely, 2^21377075 is an apocalyptic number.

21377075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21377075 is a deficient number, since it is larger than the sum of its proper divisors (6947005).

21377075 is a wasteful number, since it uses less digits than its factorization.

21377075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 482 counting only the distinct ones).

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

The square root of 21377075 is about 4623.5349030801. The cubic root of 21377075 is about 277.5339351947.

The spelling of 21377075 in words is "twenty-one million, three hundred seventy-seven thousand, seventy-five".