21242932278 has 16 divisors (see below), whose sum is σ = 42676386816. Its totient is φ = 7049223720.

The previous prime is 21242932261. The next prime is 21242932309. The reversal of 21242932278 is 87223924212.

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, 7936978 + ... + 7939653.

It is an arithmetic number, because the mean of its divisors is an integer number (2667274176).

Almost surely, 2^21242932278 is an apocalyptic number.

21242932278 is an abundant number, since it is smaller than the sum of its proper divisors (21433454538).

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

21242932278 is a wasteful number, since it uses less digits than its factorization.

21242932278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15876859.

The product of its digits is 193536, while the sum is 42.

The spelling of 21242932278 in words is "twenty-one billion, two hundred forty-two million, nine hundred thirty-two thousand, two hundred seventy-eight".