21122223002981 has 2 divisors, whose sum is σ = 21122223002982. Its totient is φ = 21122223002980.

The previous prime is 21122223002977. The next prime is 21122223003041. The reversal of 21122223002981 is 18920032222112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15742119557956 + 5380103445025 = 3967634^2 + 2319505^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122223002981 - 2² = 21122223002977 is a prime.

It is a super-2 number, since 2×21122223002981² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122223001981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561111501490 + 10561111501491.

It is an arithmetic number, because the mean of its divisors is an integer number (10561111501491).

Almost surely, 2^{21122223002981} is an apocalyptic number.

It is an amenable number.

21122223002981 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122223002981 is an equidigital number, since it uses as much as digits as its factorization.

21122223002981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The spelling of 21122223002981 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty-three million, two thousand, nine hundred eighty-one".