24002221981 has 2 divisors, whose sum is σ = 24002221982. Its totient is φ = 24002221980.

The previous prime is 24002221967. The next prime is 24002222003. The reversal of 24002221981 is 18912220042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18841954756 + 5160267225 = 137266^2 + 71835^2 .

It is a cyclic number.

It is not a de Polignac number, because 24002221981 - 2⁵ = 24002221949 is a prime.

It is a super-2 number, since 2×24002221981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24002221081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12001110990 + 12001110991.

It is an arithmetic number, because the mean of its divisors is an integer number (12001110991).

Almost surely, 2^24002221981 is an apocalyptic number.

It is an amenable number.

24002221981 is a deficient number, since it is larger than the sum of its proper divisors (1).

24002221981 is an equidigital number, since it uses as much as digits as its factorization.

24002221981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 31.

The spelling of 24002221981 in words is "twenty-four billion, two million, two hundred twenty-one thousand, nine hundred eighty-one".