2081121682421 has 2 divisors, whose sum is σ = 2081121682422. Its totient is φ = 2081121682420.

The previous prime is 2081121682417. The next prime is 2081121682433. The reversal of 2081121682421 is 1242861211802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2060045901796 + 21075780625 = 1435286^2 + 145175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081121682421 - 2² = 2081121682417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2081121682411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040560841210 + 1040560841211.

It is an arithmetic number, because the mean of its divisors is an integer number (1040560841211).

Almost surely, 2^{2081121682421} is an apocalyptic number.

It is an amenable number.

2081121682421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081121682421 is an equidigital number, since it uses as much as digits as its factorization.

2081121682421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24576, while the sum is 38.

The spelling of 2081121682421 in words is "two trillion, eighty-one billion, one hundred twenty-one million, six hundred eighty-two thousand, four hundred twenty-one".