13011221987 has 2 divisors, whose sum is σ = 13011221988. Its totient is φ = 13011221986.

The previous prime is 13011221953. The next prime is 13011222043. The reversal of 13011221987 is 78912211031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13011221987 - 2⁸ = 13011221731 is a prime.

It is not a weakly prime, because it can be changed into another prime (13011221917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6505610993 + 6505610994.

It is an arithmetic number, because the mean of its divisors is an integer number (6505610994).

Almost surely, 2^13011221987 is an apocalyptic number.

13011221987 is a deficient number, since it is larger than the sum of its proper divisors (1).

13011221987 is an equidigital number, since it uses as much as digits as its factorization.

13011221987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 35.

The spelling of 13011221987 in words is "thirteen billion, eleven million, two hundred twenty-one thousand, nine hundred eighty-seven".