213531020191 has 2 divisors, whose sum is σ = 213531020192. Its totient is φ = 213531020190.

The previous prime is 213531020173. The next prime is 213531020221. The reversal of 213531020191 is 191020135312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213531020191 - 2¹³ = 213531011999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213531020141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106765510095 + 106765510096.

It is an arithmetic number, because the mean of its divisors is an integer number (106765510096).

Almost surely, 2^213531020191 is an apocalyptic number.

213531020191 is a deficient number, since it is larger than the sum of its proper divisors (1).

213531020191 is an equidigital number, since it uses as much as digits as its factorization.

213531020191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The spelling of 213531020191 in words is "two hundred thirteen billion, five hundred thirty-one million, twenty thousand, one hundred ninety-one".