21496653 has 24 divisors (see below), whose sum is σ = 33204600. Its totient is φ = 13353984.

The previous prime is 21496649. The next prime is 21496661. The reversal of 21496653 is 35669412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11269449 + 10227204 = 3357^2 + 3198^2 .

It is not a de Polignac number, because 21496653 - 2² = 21496649 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21496613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16033 + ... + 17321.

It is an arithmetic number, because the mean of its divisors is an integer number (1383525).

Almost surely, 2^21496653 is an apocalyptic number.

It is an amenable number.

21496653 is a deficient number, since it is larger than the sum of its proper divisors (11707947).

21496653 is a wasteful number, since it uses less digits than its factorization.

21496653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421 (or 1418 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 21496653 is about 4636.4483174085. The cubic root of 21496653 is about 278.0504583806.

The spelling of 21496653 in words is "twenty-one million, four hundred ninety-six thousand, six hundred fifty-three".