21039240278 has 16 divisors (see below), whose sum is σ = 36250356384. Its totient is φ = 8971045440.

The previous prime is 21039240259. The next prime is 21039240281. The reversal of 21039240278 is 87204293012.

It is a Curzon number.

It is a congruent number.

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, 3811463 + ... + 3816978.

It is an arithmetic number, because the mean of its divisors is an integer number (2265647274).

Almost surely, 2^21039240278 is an apocalyptic number.

21039240278 is a deficient number, since it is larger than the sum of its proper divisors (15211116106).

21039240278 is a wasteful number, since it uses less digits than its factorization.

21039240278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7628647.

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 21039240278 in words is "twenty-one billion, thirty-nine million, two hundred forty thousand, two hundred seventy-eight".