21339045 has 96 divisors (see below), whose sum is σ = 47453952. Its totient is φ = 8957952.

The previous prime is 21339037. The next prime is 21339053. The reversal of 21339045 is 54093312.

It is an interprime number because it is at equal distance from previous prime (21339037) and next prime (21339053).

It is not a de Polignac number, because 21339045 - 2³ = 21339037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 110469 + ... + 110661.

It is an arithmetic number, because the mean of its divisors is an integer number (494312).

Almost surely, 2^21339045 is an apocalyptic number.

It is an amenable number.

21339045 is an abundant number, since it is smaller than the sum of its proper divisors (26114907).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21339045 is a wasteful number, since it uses less digits than its factorization.

21339045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 221 counting only the distinct ones).

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

The square root of 21339045 is about 4619.4204181910. The cubic root of 21339045 is about 277.3692590846.

The spelling of 21339045 in words is "twenty-one million, three hundred thirty-nine thousand, forty-five".