22012981 has 2 divisors, whose sum is σ = 22012982. Its totient is φ = 22012980.

The previous prime is 22012961. The next prime is 22013021. The reversal of 22012981 is 18921022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21436900 + 576081 = 4630^2 + 759^2 .

It is a cyclic number.

It is not a de Polignac number, because 22012981 - 2⁷ = 22012853 is a prime.

It is a super-2 number, since 2×22012981² = 969142665012722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22012901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11006490 + 11006491.

It is an arithmetic number, because the mean of its divisors is an integer number (11006491).

Almost surely, 2^22012981 is an apocalyptic number.

It is an amenable number.

22012981 is a deficient number, since it is larger than the sum of its proper divisors (1).

22012981 is an equidigital number, since it uses as much as digits as its factorization.

22012981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 22012981 is about 4691.7993350100. The cubic root of 22012981 is about 280.2590332488.

The spelling of 22012981 in words is "twenty-two million, twelve thousand, nine hundred eighty-one".