22421252981 has 2 divisors, whose sum is σ = 22421252982. Its totient is φ = 22421252980.

The previous prime is 22421252963. The next prime is 22421253079. The reversal of 22421252981 is 18925212422.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14881804081 + 7539448900 = 121991^2 + 86830^2 .

It is a cyclic number.

It is not a de Polignac number, because 22421252981 - 2¹⁴ = 22421236597 is a prime.

It is a super-2 number, since 2×22421252981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22421252921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11210626490 + 11210626491.

It is an arithmetic number, because the mean of its divisors is an integer number (11210626491).

Almost surely, 2^22421252981 is an apocalyptic number.

It is an amenable number.

22421252981 is a deficient number, since it is larger than the sum of its proper divisors (1).

22421252981 is an equidigital number, since it uses as much as digits as its factorization.

22421252981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 38.

The spelling of 22421252981 in words is "twenty-two billion, four hundred twenty-one million, two hundred fifty-two thousand, nine hundred eighty-one".