21477085 has 16 divisors (see below), whose sum is σ = 29632896. Its totient is φ = 14637888.

The previous prime is 21477077. The next prime is 21477089. The reversal of 21477085 is 58077412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21477085 - 2³ = 21477077 is a prime.

It is a super-2 number, since 2×21477085² = 922530360194450, which contains 22 as substring.

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 21477085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21477089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4282 + ... + 7828.

It is an arithmetic number, because the mean of its divisors is an integer number (1852056).

Almost surely, 2^21477085 is an apocalyptic number.

It is an amenable number.

21477085 is a deficient number, since it is larger than the sum of its proper divisors (8155811).

21477085 is a wasteful number, since it uses less digits than its factorization.

21477085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3732.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 21477085 is about 4634.3376009954. The cubic root of 21477085 is about 277.9660647292.

The spelling of 21477085 in words is "twenty-one million, four hundred seventy-seven thousand, eighty-five".