22221999913 has 2 divisors, whose sum is σ = 22221999914. Its totient is φ = 22221999912.

The previous prime is 22221999887. The next prime is 22221999949. The reversal of 22221999913 is 31999912222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16736079424 + 5485920489 = 129368^2 + 74067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22221999913 is a prime.

It is not a weakly prime, because it can be changed into another prime (22221999313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110999956 + 11110999957.

It is an arithmetic number, because the mean of its divisors is an integer number (11110999957).

Almost surely, 2^22221999913 is an apocalyptic number.

It is an amenable number.

22221999913 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221999913 is an equidigital number, since it uses as much as digits as its factorization.

22221999913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 49.

The spelling of 22221999913 in words is "twenty-two billion, two hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred thirteen".