21412330981 has 2 divisors, whose sum is σ = 21412330982. Its totient is φ = 21412330980.

The previous prime is 21412330921. The next prime is 21412331023. The reversal of 21412330981 is 18903321412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21078684225 + 333646756 = 145185^2 + 18266^2 .

It is a cyclic number.

It is not a de Polignac number, because 21412330981 - 2⁷ = 21412330853 is a prime.

It is a super-2 number, since 2×21412330981² (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 (21412330921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706165490 + 10706165491.

It is an arithmetic number, because the mean of its divisors is an integer number (10706165491).

Almost surely, 2^21412330981 is an apocalyptic number.

It is an amenable number.

21412330981 is a deficient number, since it is larger than the sum of its proper divisors (1).

21412330981 is an equidigital number, since it uses as much as digits as its factorization.

21412330981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 21412330981 in words is "twenty-one billion, four hundred twelve million, three hundred thirty thousand, nine hundred eighty-one".