20324112212981 has 2 divisors, whose sum is σ = 20324112212982. Its totient is φ = 20324112212980.

The previous prime is 20324112212977. The next prime is 20324112213077. The reversal of 20324112212981 is 18921221142302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13436689340881 + 6887422872100 = 3665609^2 + 2624390^2 .

It is a cyclic number.

It is not a de Polignac number, because 20324112212981 - 2² = 20324112212977 is a prime.

It is a super-2 number, since 2×20324112212981² (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 (20324112212941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10162056106490 + 10162056106491.

It is an arithmetic number, because the mean of its divisors is an integer number (10162056106491).

Almost surely, 2^{20324112212981} is an apocalyptic number.

It is an amenable number.

20324112212981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20324112212981 is an equidigital number, since it uses as much as digits as its factorization.

20324112212981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 20324112212981 in words is "twenty trillion, three hundred twenty-four billion, one hundred twelve million, two hundred twelve thousand, nine hundred eighty-one".