21743379 has 12 divisors (see below), whose sum is σ = 35893936. Its totient is φ = 12424752.

The previous prime is 21743341. The next prime is 21743413. The reversal of 21743379 is 97334712.

21743379 is a `hidden beast` number, since 217 + 433 + 7 + 9 = 666.

It is not a de Polignac number, because 21743379 - 2¹⁹ = 21219091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21742379) 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 11 ways as a sum of consecutive naturals, for example, 172504 + ... + 172629.

Almost surely, 2^21743379 is an apocalyptic number.

21743379 is a deficient number, since it is larger than the sum of its proper divisors (14150557).

21743379 is a wasteful number, since it uses less digits than its factorization.

21743379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345146 (or 345143 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 21743379 is about 4662.9796268052. The cubic root of 21743379 is about 279.1101811709.

It can be divided in two parts, 21743 and 379, that added together give a palindrome (22122).

The spelling of 21743379 in words is "twenty-one million, seven hundred forty-three thousand, three hundred seventy-nine".