21390022834 has 16 divisors (see below), whose sum is σ = 32893100856. Its totient is φ = 10426060800.

The previous prime is 21390022831. The next prime is 21390022853. The reversal of 21390022834 is 43822009312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20890366225 + 499656609 = 144535^2 + 22353^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21390022834.

It is not an unprimeable number, because it can be changed into a prime (21390022831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5794 + ... + 206914.

Almost surely, 2^21390022834 is an apocalyptic number.

21390022834 is a deficient number, since it is larger than the sum of its proper divisors (11503078022).

21390022834 is a wasteful number, since it uses less digits than its factorization.

21390022834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202461.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 21390022834 in words is "twenty-one billion, three hundred ninety million, twenty-two thousand, eight hundred thirty-four".