21412457 has 8 divisors (see below), whose sum is σ = 23755680. Its totient is φ = 19135360.

The previous prime is 21412451. The next prime is 21412493. The reversal of 21412457 is 75421412.

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

It is a cyclic number.

It is not a de Polignac number, because 21412457 - 2⁴ = 21412441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21412451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15848 + ... + 17145.

It is an arithmetic number, because the mean of its divisors is an integer number (2969460).

Almost surely, 2^21412457 is an apocalyptic number.

It is an amenable number.

21412457 is a deficient number, since it is larger than the sum of its proper divisors (2343223).

21412457 is a wasteful number, since it uses less digits than its factorization.

21412457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33063.

The product of its digits is 2240, while the sum is 26.

The square root of 21412457 is about 4627.3596142941. The cubic root of 21412457 is about 277.6869697425.

Adding to 21412457 its reverse (75421412), we get a palindrome (96833869).

The spelling of 21412457 in words is "twenty-one million, four hundred twelve thousand, four hundred fifty-seven".