21413493 has 6 divisors (see below), whose sum is σ = 30930614. Its totient is φ = 14275656.

The previous prime is 21413479. The next prime is 21413531. The reversal of 21413493 is 39431412.

It can be written as a sum of positive squares in only one way, i.e., 16990884 + 4422609 = 4122^2 + 2103^2 .

It is not a de Polignac number, because 21413493 - 2⁴ = 21413477 is a prime.

It is a super-2 number, since 2×21413493² = 917075364922098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1189630 + ... + 1189647.

Almost surely, 2^21413493 is an apocalyptic number.

It is an amenable number.

21413493 is a deficient number, since it is larger than the sum of its proper divisors (9517121).

21413493 is a wasteful number, since it uses less digits than its factorization.

21413493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379283 (or 2379280 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 21413493 is about 4627.4715558283. The cubic root of 21413493 is about 277.6914481178.

The spelling of 21413493 in words is "twenty-one million, four hundred thirteen thousand, four hundred ninety-three".