213797221101787 has 2 divisors, whose sum is σ = 213797221101788. Its totient is φ = 213797221101786.

The previous prime is 213797221101781. The next prime is 213797221101811. The reversal of 213797221101787 is 787101122797312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213797221101787 - 2¹¹ = 213797221099739 is a prime.

It is not a weakly prime, because it can be changed into another prime (213797221101781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106898610550893 + 106898610550894.

It is an arithmetic number, because the mean of its divisors is an integer number (106898610550894).

Almost surely, 2^{213797221101787} is an apocalyptic number.

213797221101787 is a deficient number, since it is larger than the sum of its proper divisors (1).

213797221101787 is an equidigital number, since it uses as much as digits as its factorization.

213797221101787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4148928, while the sum is 58.

The spelling of 213797221101787 in words is "two hundred thirteen trillion, seven hundred ninety-seven billion, two hundred twenty-one million, one hundred one thousand, seven hundred eighty-seven".