2121420241181 has 2 divisors, whose sum is σ = 2121420241182. Its totient is φ = 2121420241180.

The previous prime is 2121420241169. The next prime is 2121420241207. The reversal of 2121420241181 is 1811420241212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2064422976100 + 56997265081 = 1436810^2 + 238741^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121420241181 - 2¹⁴ = 2121420224797 is a prime.

It is a super-2 number, since 2×2121420241181² (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 (2121420241121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060710120590 + 1060710120591.

It is an arithmetic number, because the mean of its divisors is an integer number (1060710120591).

Almost surely, 2^{2121420241181} is an apocalyptic number.

It is an amenable number.

2121420241181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121420241181 is an equidigital number, since it uses as much as digits as its factorization.

2121420241181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 29.

Adding to 2121420241181 its reverse (1811420241212), we get a palindrome (3932840482393).

The spelling of 2121420241181 in words is "two trillion, one hundred twenty-one billion, four hundred twenty million, two hundred forty-one thousand, one hundred eighty-one".