221233231291 has 2 divisors, whose sum is σ = 221233231292. Its totient is φ = 221233231290.

The previous prime is 221233231273. The next prime is 221233231399. The reversal of 221233231291 is 192132332122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221233231291 is a prime.

It is not a weakly prime, because it can be changed into another prime (221233231091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110616615645 + 110616615646.

It is an arithmetic number, because the mean of its divisors is an integer number (110616615646).

Almost surely, 2^221233231291 is an apocalyptic number.

221233231291 is a deficient number, since it is larger than the sum of its proper divisors (1).

221233231291 is an equidigital number, since it uses as much as digits as its factorization.

221233231291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

The spelling of 221233231291 in words is "two hundred twenty-one billion, two hundred thirty-three million, two hundred thirty-one thousand, two hundred ninety-one".