10244321981 has 2 divisors, whose sum is σ = 10244321982. Its totient is φ = 10244321980.

The previous prime is 10244321977. The next prime is 10244322013. The reversal of 10244321981 is 18912344201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10153786756 + 90535225 = 100766^2 + 9515^2 .

It is a cyclic number.

It is not a de Polignac number, because 10244321981 - 2² = 10244321977 is a prime.

It is a super-2 number, since 2×10244321981² (a number of 21 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 (10244321911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5122160990 + 5122160991.

It is an arithmetic number, because the mean of its divisors is an integer number (5122160991).

Almost surely, 2^10244321981 is an apocalyptic number.

It is an amenable number.

10244321981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10244321981 is an equidigital number, since it uses as much as digits as its factorization.

10244321981 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 10244321981 in words is "ten billion, two hundred forty-four million, three hundred twenty-one thousand, nine hundred eighty-one".