21332010131981 has 2 divisors, whose sum is σ = 21332010131982. Its totient is φ = 21332010131980.

The previous prime is 21332010131903. The next prime is 21332010132001. The reversal of 21332010131981 is 18913101023312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20355806851081 + 976203280900 = 4511741^2 + 988030^2 .

It is a cyclic number.

It is not a de Polignac number, because 21332010131981 - 2¹⁰ = 21332010130957 is a prime.

It is a super-2 number, since 2×21332010131981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21332010131581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666005065990 + 10666005065991.

It is an arithmetic number, because the mean of its divisors is an integer number (10666005065991).

Almost surely, 2^{21332010131981} is an apocalyptic number.

It is an amenable number.

21332010131981 is a deficient number, since it is larger than the sum of its proper divisors (1).

21332010131981 is an equidigital number, since it uses as much as digits as its factorization.

21332010131981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 21332010131981 in words is "twenty-one trillion, three hundred thirty-two billion, ten million, one hundred thirty-one thousand, nine hundred eighty-one".