21607473 has 16 divisors (see below), whose sum is σ = 29465856. Its totient is φ = 14081040.

The previous prime is 21607471. The next prime is 21607477. The reversal of 21607473 is 37470612.

It is not a de Polignac number, because 21607473 - 2¹ = 21607471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21607473.

It is not an unprimeable number, because it can be changed into a prime (21607471) 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 15 ways as a sum of consecutive naturals, for example, 26238 + ... + 27048.

It is an arithmetic number, because the mean of its divisors is an integer number (1841616).

Almost surely, 2^21607473 is an apocalyptic number.

It is an amenable number.

21607473 is a deficient number, since it is larger than the sum of its proper divisors (7858383).

21607473 is a wasteful number, since it uses less digits than its factorization.

21607473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 21607473 is about 4648.3839127163. The cubic root of 21607473 is about 278.5274435297.

The spelling of 21607473 in words is "twenty-one million, six hundred seven thousand, four hundred seventy-three".