21602497 has 8 divisors (see below), whose sum is σ = 25762176. Its totient is φ = 17711232.

The previous prime is 21602491. The next prime is 21602501. The reversal of 21602497 is 79420612.

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

It is not a de Polignac number, because 21602497 - 2³ = 21602489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21602491) 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, 66928 + ... + 67249.

It is an arithmetic number, because the mean of its divisors is an integer number (3220272).

Almost surely, 2^21602497 is an apocalyptic number.

It is an amenable number.

21602497 is a deficient number, since it is larger than the sum of its proper divisors (4159679).

21602497 is a wasteful number, since it uses less digits than its factorization.

21602497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134207.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 21602497 is about 4647.8486421139. The cubic root of 21602497 is about 278.5060611286.

The spelling of 21602497 in words is "twenty-one million, six hundred two thousand, four hundred ninety-seven".