21339140 has 24 divisors (see below), whose sum is σ = 44983512. Its totient is φ = 8503040.

The previous prime is 21339139. The next prime is 21339151. The reversal of 21339140 is 4193312.

It can be written as a sum of positive squares in 4 ways, for example, as 123904 + 21215236 = 352^2 + 4606^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3722 + ... + 7518.

It is an arithmetic number, because the mean of its divisors is an integer number (1874313).

Almost surely, 2^21339140 is an apocalyptic number.

21339140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21339140 is an abundant number, since it is smaller than the sum of its proper divisors (23644372).

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

21339140 is a wasteful number, since it uses less digits than its factorization.

21339140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4087 (or 4085 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 21339140 is about 4619.4307008548. The cubic root of 21339140 is about 277.3696706938.

The spelling of 21339140 in words is "twenty-one million, three hundred thirty-nine thousand, one hundred forty".