22212301981 has 2 divisors, whose sum is σ = 22212301982. Its totient is φ = 22212301980.

The previous prime is 22212301931. The next prime is 22212301997. The reversal of 22212301981 is 18910321222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16735561956 + 5476740025 = 129366^2 + 74005^2 .

It is a cyclic number.

It is not a de Polignac number, because 22212301981 - 2¹⁵ = 22212269213 is a prime.

It is a super-2 number, since 2×22212301981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22212301931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11106150990 + 11106150991.

It is an arithmetic number, because the mean of its divisors is an integer number (11106150991).

Almost surely, 2^22212301981 is an apocalyptic number.

It is an amenable number.

22212301981 is a deficient number, since it is larger than the sum of its proper divisors (1).

22212301981 is an equidigital number, since it uses as much as digits as its factorization.

22212301981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 22212301981 in words is "twenty-two billion, two hundred twelve million, three hundred one thousand, nine hundred eighty-one".