21496689 has 12 divisors (see below), whose sum is σ = 31773456. Its totient is φ = 13997592.

The previous prime is 21496679. The next prime is 21496703. The reversal of 21496689 is 98669412.

It is a happy number.

It is not a de Polignac number, because 21496689 - 2¹² = 21492593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21496649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27387 + ... + 28160.

It is an arithmetic number, because the mean of its divisors is an integer number (2647788).

Almost surely, 2^21496689 is an apocalyptic number.

It is an amenable number.

21496689 is a deficient number, since it is larger than the sum of its proper divisors (10276767).

21496689 is a wasteful number, since it uses less digits than its factorization.

21496689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55596 (or 55593 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 21496689 is about 4636.4521996889. The cubic root of 21496689 is about 278.0506135957.

The spelling of 21496689 in words is "twenty-one million, four hundred ninety-six thousand, six hundred eighty-nine".