21077875 has 64 divisors (see below), whose sum is σ = 34594560. Its totient is φ = 12441600.

The previous prime is 21077873. The next prime is 21077887. The reversal of 21077875 is 57877012.

It is not a de Polignac number, because 21077875 - 2¹ = 21077873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21077873) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 193321 + ... + 193429.

It is an arithmetic number, because the mean of its divisors is an integer number (540540).

Almost surely, 2^21077875 is an apocalyptic number.

21077875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21077875 is a deficient number, since it is larger than the sum of its proper divisors (13516685).

21077875 is a wasteful number, since it uses less digits than its factorization.

21077875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 21077875 is about 4591.0646913325. The cubic root of 21077875 is about 276.2330306318.

It can be divided in two parts, 21077 and 875, that added together give a cube (21952 = 28³).

The spelling of 21077875 in words is "twenty-one million, seventy-seven thousand, eight hundred seventy-five".