2121400240039 has 2 divisors, whose sum is σ = 2121400240040. Its totient is φ = 2121400240038.

The previous prime is 2121400239991. The next prime is 2121400240061. The reversal of 2121400240039 is 9300420041212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121400240039 - 2¹¹ = 2121400237991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121400239989 and 2121400240016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121400240139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060700120019 + 1060700120020.

It is an arithmetic number, because the mean of its divisors is an integer number (1060700120020).

Almost surely, 2^{2121400240039} is an apocalyptic number.

2121400240039 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121400240039 is an equidigital number, since it uses as much as digits as its factorization.

2121400240039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 2121400240039 in words is "two trillion, one hundred twenty-one billion, four hundred million, two hundred forty thousand, thirty-nine".