22013021981 has 2 divisors, whose sum is σ = 22013021982. Its totient is φ = 22013021980.

The previous prime is 22013021971. The next prime is 22013022023. The reversal of 22013021981 is 18912031022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22000305625 + 12716356 = 148325^2 + 3566^2 .

It is a cyclic number.

It is not a de Polignac number, because 22013021981 - 2¹⁰ = 22013020957 is a prime.

It is a super-2 number, since 2×22013021981² (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 (22013021941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11006510990 + 11006510991.

It is an arithmetic number, because the mean of its divisors is an integer number (11006510991).

Almost surely, 2^22013021981 is an apocalyptic number.

It is an amenable number.

22013021981 is a deficient number, since it is larger than the sum of its proper divisors (1).

22013021981 is an equidigital number, since it uses as much as digits as its factorization.

22013021981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 22013021981 in words is "twenty-two billion, thirteen million, twenty-one thousand, nine hundred eighty-one".