21412497 has 8 divisors (see below), whose sum is σ = 28573600. Its totient is φ = 14263200.

The previous prime is 21412493. The next prime is 21412499. The reversal of 21412497 is 79421412.

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

It is not a de Polignac number, because 21412497 - 2² = 21412493 is a prime.

It is a super-4 number, since 4×21412497⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21412493) 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, 2997 + ... + 7197.

It is an arithmetic number, because the mean of its divisors is an integer number (3571700).

Almost surely, 2^21412497 is an apocalyptic number.

It is an amenable number.

21412497 is a deficient number, since it is larger than the sum of its proper divisors (7161103).

21412497 is a wasteful number, since it uses less digits than its factorization.

21412497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5903.

The product of its digits is 4032, while the sum is 30.

The square root of 21412497 is about 4627.3639364113. The cubic root of 21412497 is about 277.6871426554.

The spelling of 21412497 in words is "twenty-one million, four hundred twelve thousand, four hundred ninety-seven".