213231212291 has 2 divisors, whose sum is σ = 213231212292. Its totient is φ = 213231212290.

The previous prime is 213231212287. The next prime is 213231212339. The reversal of 213231212291 is 192212132312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213231212291 - 2² = 213231212287 is a prime.

It is not a weakly prime, because it can be changed into another prime (213231212191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106615606145 + 106615606146.

It is an arithmetic number, because the mean of its divisors is an integer number (106615606146).

Almost surely, 2^213231212291 is an apocalyptic number.

213231212291 is a deficient number, since it is larger than the sum of its proper divisors (1).

213231212291 is an equidigital number, since it uses as much as digits as its factorization.

213231212291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The spelling of 213231212291 in words is "two hundred thirteen billion, two hundred thirty-one million, two hundred twelve thousand, two hundred ninety-one".