21377343 has 16 divisors (see below), whose sum is σ = 30927456. Its totient is φ = 13056000.

The previous prime is 21377333. The next prime is 21377351. The reversal of 21377343 is 34377312.

It is not a de Polignac number, because 21377343 - 2⁵ = 21377311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21377343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21377303) 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 15 ways as a sum of consecutive naturals, for example, 3343 + ... + 7343.

It is an arithmetic number, because the mean of its divisors is an integer number (1932966).

Almost surely, 2^21377343 is an apocalyptic number.

21377343 is a deficient number, since it is larger than the sum of its proper divisors (9550113).

21377343 is a wasteful number, since it uses less digits than its factorization.

21377343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4154.

The product of its digits is 10584, while the sum is 30.

The square root of 21377343 is about 4623.5638851431. The cubic root of 21377343 is about 277.5350949852.

The spelling of 21377343 in words is "twenty-one million, three hundred seventy-seven thousand, three hundred forty-three".