21893413 has 8 divisors (see below), whose sum is σ = 22195800. Its totient is φ = 21593088.

The previous prime is 21893393. The next prime is 21893423. The reversal of 21893413 is 31439812.

It can be written as a sum of positive squares in 4 ways, for example, as 1481089 + 20412324 = 1217^2 + 4518^2 .

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 21893413 - 2⁹ = 21892901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21893423) 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, 38193 + ... + 38761.

It is an arithmetic number, because the mean of its divisors is an integer number (2774475).

Almost surely, 2^21893413 is an apocalyptic number.

It is an amenable number.

21893413 is a deficient number, since it is larger than the sum of its proper divisors (302387).

21893413 is a wasteful number, since it uses less digits than its factorization.

21893413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031.

The product of its digits is 5184, while the sum is 31.

The square root of 21893413 is about 4679.0397519149. The cubic root of 21893413 is about 279.7506836830.

The spelling of 21893413 in words is "twenty-one million, eight hundred ninety-three thousand, four hundred thirteen".