21610617 has 12 divisors (see below), whose sum is σ = 33518736. Its totient is φ = 12348840.

The previous prime is 21610609. The next prime is 21610643. The reversal of 21610617 is 71601612.

It is not a de Polignac number, because 21610617 - 2³ = 21610609 is a prime.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21610607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73359 + ... + 73652.

It is an arithmetic number, because the mean of its divisors is an integer number (2793228).

Almost surely, 2^21610617 is an apocalyptic number.

It is an amenable number.

21610617 is a deficient number, since it is larger than the sum of its proper divisors (11908119).

21610617 is a wasteful number, since it uses less digits than its factorization.

21610617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147028 (or 147021 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21610617 is about 4648.7220824652. The cubic root of 21610617 is about 278.5409519397.

The spelling of 21610617 in words is "twenty-one million, six hundred ten thousand, six hundred seventeen".