21222378813 has 8 divisors (see below), whose sum is σ = 28637427168. Its totient is φ = 13977791504.

The previous prime is 21222378803. The next prime is 21222378847. The reversal of 21222378813 is 31887322212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21222378813 - 2⁴ = 21222378797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222378803) 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, 42614970 + ... + 42615467.

It is an arithmetic number, because the mean of its divisors is an integer number (3579678396).

Almost surely, 2^21222378813 is an apocalyptic number.

It is an amenable number.

21222378813 is a deficient number, since it is larger than the sum of its proper divisors (7415048355).

21222378813 is an equidigital number, since it uses as much as digits as its factorization.

21222378813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85230523.

The product of its digits is 64512, while the sum is 39.

The spelling of 21222378813 in words is "twenty-one billion, two hundred twenty-two million, three hundred seventy-eight thousand, eight hundred thirteen".