21554675 has 6 divisors (see below), whose sum is σ = 26727828. Its totient is φ = 17243720.

The previous prime is 21554671. The next prime is 21554681. The reversal of 21554675 is 57645512.

It is not a de Polignac number, because 21554675 - 2² = 21554671 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21554671) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 431069 + ... + 431118.

It is an arithmetic number, because the mean of its divisors is an integer number (4454638).

Almost surely, 2^21554675 is an apocalyptic number.

21554675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21554675 is a deficient number, since it is larger than the sum of its proper divisors (5173153).

21554675 is an equidigital number, since it uses as much as digits as its factorization.

21554675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862197 (or 862192 counting only the distinct ones).

The product of its digits is 42000, while the sum is 35.

The square root of 21554675 is about 4642.7012611194. The cubic root of 21554675 is about 278.3003972964.

The spelling of 21554675 in words is "twenty-one million, five hundred fifty-four thousand, six hundred seventy-five".