21496651 has 8 divisors (see below), whose sum is σ = 24470784. Its totient is φ = 18692520.

The previous prime is 21496649. The next prime is 21496661. The reversal of 21496651 is 15669412.

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

It is not a de Polignac number, because 21496651 - 2¹ = 21496649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21496661) 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, 42231 + ... + 42736.

It is an arithmetic number, because the mean of its divisors is an integer number (3058848).

Almost surely, 2^21496651 is an apocalyptic number.

21496651 is a deficient number, since it is larger than the sum of its proper divisors (2974133).

21496651 is a wasteful number, since it uses less digits than its factorization.

21496651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85001.

The product of its digits is 12960, while the sum is 34.

The square root of 21496651 is about 4636.4481017261. The cubic root of 21496651 is about 278.0504497576.

The spelling of 21496651 in words is "twenty-one million, four hundred ninety-six thousand, six hundred fifty-one".