213797917987 has 2 divisors, whose sum is σ = 213797917988. Its totient is φ = 213797917986.

The previous prime is 213797917919. The next prime is 213797918017. The reversal of 213797917987 is 789719797312.

213797917987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213797917987 - 2⁷ = 213797917859 is a prime.

It is not a weakly prime, because it can be changed into another prime (213797917187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106898958993 + 106898958994.

It is an arithmetic number, because the mean of its divisors is an integer number (106898958994).

Almost surely, 2^213797917987 is an apocalyptic number.

213797917987 is a deficient number, since it is larger than the sum of its proper divisors (1).

213797917987 is an equidigital number, since it uses as much as digits as its factorization.

213797917987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84015792, while the sum is 70.

The spelling of 213797917987 in words is "two hundred thirteen billion, seven hundred ninety-seven million, nine hundred seventeen thousand, nine hundred eighty-seven".