21294075786 has 32 divisors (see below), whose sum is σ = 44469278208. Its totient is φ = 6784913520.

The previous prime is 21294075779. The next prime is 21294075791. The reversal of 21294075786 is 68757049212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160885 + ... + 261671.

It is an arithmetic number, because the mean of its divisors is an integer number (1389664944).

Almost surely, 2^21294075786 is an apocalyptic number.

21294075786 is an abundant number, since it is smaller than the sum of its proper divisors (23175202422).

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

21294075786 is a wasteful number, since it uses less digits than its factorization.

21294075786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102346.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 21294075786 in words is "twenty-one billion, two hundred ninety-four million, seventy-five thousand, seven hundred eighty-six".