21876975 has 18 divisors (see below), whose sum is σ = 39184496. Its totient is φ = 11667600.

The previous prime is 21876973. The next prime is 21876983. The reversal of 21876975 is 57967812.

It is not a de Polignac number, because 21876975 - 2¹ = 21876973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21876975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21876973) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 48391 + ... + 48840.

Almost surely, 2^21876975 is an apocalyptic number.

21876975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21876975 is a deficient number, since it is larger than the sum of its proper divisors (17307521).

21876975 is a wasteful number, since it uses less digits than its factorization.

21876975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97247 (or 97239 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 21876975 is about 4677.2828650831. The cubic root of 21876975 is about 279.6806520696.

The spelling of 21876975 in words is "twenty-one million, eight hundred seventy-six thousand, nine hundred seventy-five".