21786213396 has 24 divisors (see below), whose sum is σ = 51550478784. Its totient is φ = 7159788160.

The previous prime is 21786213391. The next prime is 21786213401. The reversal of 21786213396 is 69331268712.

It is an interprime number because it is at equal distance from previous prime (21786213391) and next prime (21786213401).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21786213391) 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, 12784485 + ... + 12786188.

It is an arithmetic number, because the mean of its divisors is an integer number (2147936616).

Almost surely, 2^21786213396 is an apocalyptic number.

It is an amenable number.

21786213396 is an abundant number, since it is smaller than the sum of its proper divisors (29764265388).

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

21786213396 is a wasteful number, since it uses less digits than its factorization.

21786213396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25570751 (or 25570749 counting only the distinct ones).

The product of its digits is 653184, while the sum is 48.

The spelling of 21786213396 in words is "twenty-one billion, seven hundred eighty-six million, two hundred thirteen thousand, three hundred ninety-six".