2113021021987 has 2 divisors, whose sum is σ = 2113021021988. Its totient is φ = 2113021021986.

The previous prime is 2113021021973. The next prime is 2113021022023. The reversal of 2113021021987 is 7891201203112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2113021021987 - 2¹⁹ = 2113020497699 is a prime.

It is not a weakly prime, because it can be changed into another prime (2113021025987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056510510993 + 1056510510994.

It is an arithmetic number, because the mean of its divisors is an integer number (1056510510994).

Almost surely, 2^{2113021021987} is an apocalyptic number.

2113021021987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113021021987 is an equidigital number, since it uses as much as digits as its factorization.

2113021021987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The spelling of 2113021021987 in words is "two trillion, one hundred thirteen billion, twenty-one million, twenty-one thousand, nine hundred eighty-seven".