2121123302981 has 2 divisors, whose sum is σ = 2121123302982. Its totient is φ = 2121123302980.

The previous prime is 2121123302959. The next prime is 2121123303007. The reversal of 2121123302981 is 1892033211212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2054434888900 + 66688414081 = 1433330^2 + 258241^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121123302981 - 2²² = 2121119108677 is a prime.

It is a super-2 number, since 2×2121123302981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121123302941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060561651490 + 1060561651491.

It is an arithmetic number, because the mean of its divisors is an integer number (1060561651491).

Almost surely, 2^{2121123302981} is an apocalyptic number.

It is an amenable number.

2121123302981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121123302981 is an equidigital number, since it uses as much as digits as its factorization.

2121123302981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 2121123302981 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, three hundred two thousand, nine hundred eighty-one".