22306521821 has 2 divisors, whose sum is σ = 22306521822. Its totient is φ = 22306521820.

The previous prime is 22306521739. The next prime is 22306521847. The reversal of 22306521821 is 12812560322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22019592100 + 286929721 = 148390^2 + 16939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22306521821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22306521521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11153260910 + 11153260911.

It is an arithmetic number, because the mean of its divisors is an integer number (11153260911).

Almost surely, 2^22306521821 is an apocalyptic number.

It is an amenable number.

22306521821 is a deficient number, since it is larger than the sum of its proper divisors (1).

22306521821 is an equidigital number, since it uses as much as digits as its factorization.

22306521821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 22306521821 in words is "twenty-two billion, three hundred six million, five hundred twenty-one thousand, eight hundred twenty-one".