21713485 has 32 divisors (see below), whose sum is σ = 28984320. Its totient is φ = 15552000.

The previous prime is 21713479. The next prime is 21713491. The reversal of 21713485 is 58431712.

It is an interprime number because it is at equal distance from previous prime (21713479) and next prime (21713491).

It is not a de Polignac number, because 21713485 - 2⁹ = 21712973 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 214935 + ... + 215035.

It is an arithmetic number, because the mean of its divisors is an integer number (905760).

Almost surely, 2^21713485 is an apocalyptic number.

It is an amenable number.

21713485 is a deficient number, since it is larger than the sum of its proper divisors (7270835).

21713485 is a wasteful number, since it uses less digits than its factorization.

21713485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229.

The product of its digits is 6720, while the sum is 31.

The square root of 21713485 is about 4659.7730631437. The cubic root of 21713485 is about 278.9822104680.

The spelling of 21713485 in words is "twenty-one million, seven hundred thirteen thousand, four hundred eighty-five".