22001306981 has 2 divisors, whose sum is σ = 22001306982. Its totient is φ = 22001306980.

The previous prime is 22001306851. The next prime is 22001306983. The reversal of 22001306981 is 18960310022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11953048900 + 10048258081 = 109330^2 + 100241^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001306981 - 2¹⁸ = 22001044837 is a prime.

It is a super-2 number, since 2×22001306981² (a number of 21 digits) contains 22 as substring.

Together with 22001306983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22001306983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000653490 + 11000653491.

It is an arithmetic number, because the mean of its divisors is an integer number (11000653491).

Almost surely, 2^22001306981 is an apocalyptic number.

It is an amenable number.

22001306981 is a deficient number, since it is larger than the sum of its proper divisors (1).

22001306981 is an equidigital number, since it uses as much as digits as its factorization.

22001306981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 22001306981 in words is "twenty-two billion, one million, three hundred six thousand, nine hundred eighty-one".