21712465 has 8 divisors (see below), whose sum is σ = 26140608. Its totient is φ = 17312880.

The previous prime is 21712423. The next prime is 21712469. The reversal of 21712465 is 56421712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21712465 - 2¹¹ = 21710417 is a prime.

It is a super-2 number, since 2×21712465² = 942862272752450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21712469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5427 + ... + 8536.

It is an arithmetic number, because the mean of its divisors is an integer number (3267576).

Almost surely, 2^21712465 is an apocalyptic number.

It is an amenable number.

21712465 is a deficient number, since it is larger than the sum of its proper divisors (4428143).

21712465 is a wasteful number, since it uses less digits than its factorization.

21712465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14279.

The product of its digits is 3360, while the sum is 28.

The square root of 21712465 is about 4659.6636144683. The cubic root of 21712465 is about 278.9778419644.

The spelling of 21712465 in words is "twenty-one million, seven hundred twelve thousand, four hundred sixty-five".