21054339 has 6 divisors (see below), whose sum is σ = 30411836. Its totient is φ = 14036220.

The previous prime is 21054329. The next prime is 21054343. The reversal of 21054339 is 93345012.

It is not a de Polignac number, because 21054339 - 2⁴ = 21054323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21054329) 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, 1169677 + ... + 1169694.

Almost surely, 2^21054339 is an apocalyptic number.

21054339 is a deficient number, since it is larger than the sum of its proper divisors (9357497).

21054339 is a wasteful number, since it uses less digits than its factorization.

21054339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2339377 (or 2339374 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 21054339 is about 4588.5007355344. The cubic root of 21054339 is about 276.1301764623.

The spelling of 21054339 in words is "twenty-one million, fifty-four thousand, three hundred thirty-nine".