213520121551987 has 2 divisors, whose sum is σ = 213520121551988. Its totient is φ = 213520121551986.

The previous prime is 213520121551981. The next prime is 213520121552011. The reversal of 213520121551987 is 789155121025312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213520121551987 - 2¹¹ = 213520121549939 is a prime.

It is not a weakly prime, because it can be changed into another prime (213520121551981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106760060775993 + 106760060775994.

It is an arithmetic number, because the mean of its divisors is an integer number (106760060775994).

Almost surely, 2^{213520121551987} is an apocalyptic number.

213520121551987 is a deficient number, since it is larger than the sum of its proper divisors (1).

213520121551987 is an equidigital number, since it uses as much as digits as its factorization.

213520121551987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512000, while the sum is 52.

The spelling of 213520121551987 in words is "two hundred thirteen trillion, five hundred twenty billion, one hundred twenty-one million, five hundred fifty-one thousand, nine hundred eighty-seven".