21715485 has 32 divisors (see below), whose sum is σ = 38938752. Its totient is φ = 10241280.

The previous prime is 21715471. The next prime is 21715489. The reversal of 21715485 is 58451712.

It is not a de Polignac number, because 21715485 - 2⁷ = 21715357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21715489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4327 + ... + 7883.

It is an arithmetic number, because the mean of its divisors is an integer number (1216836).

Almost surely, 2^21715485 is an apocalyptic number.

It is an amenable number.

21715485 is a deficient number, since it is larger than the sum of its proper divisors (17223267).

21715485 is a wasteful number, since it uses less digits than its factorization.

21715485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3613.

The product of its digits is 11200, while the sum is 33.

The square root of 21715485 is about 4659.9876609279. The cubic root of 21715485 is about 278.9907757642.

The spelling of 21715485 in words is "twenty-one million, seven hundred fifteen thousand, four hundred eighty-five".