2121901438487 has 2 divisors, whose sum is σ = 2121901438488. Its totient is φ = 2121901438486.

The previous prime is 2121901438477. The next prime is 2121901438513. The reversal of 2121901438487 is 7848341091212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121901438487 - 2⁴ = 2121901438471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121901438477) 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, 1060950719243 + 1060950719244.

It is an arithmetic number, because the mean of its divisors is an integer number (1060950719244).

Almost surely, 2^{2121901438487} is an apocalyptic number.

2121901438487 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121901438487 is an equidigital number, since it uses as much as digits as its factorization.

2121901438487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 2121901438487 in words is "two trillion, one hundred twenty-one billion, nine hundred one million, four hundred thirty-eight thousand, four hundred eighty-seven".