221131332091 has 2 divisors, whose sum is σ = 221131332092. Its totient is φ = 221131332090.

The previous prime is 221131332011. The next prime is 221131332131. The reversal of 221131332091 is 190233131122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221131332091 - 2¹³ = 221131323899 is a prime.

It is not a weakly prime, because it can be changed into another prime (221131332001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110565666045 + 110565666046.

It is an arithmetic number, because the mean of its divisors is an integer number (110565666046).

Almost surely, 2^221131332091 is an apocalyptic number.

221131332091 is a deficient number, since it is larger than the sum of its proper divisors (1).

221131332091 is an equidigital number, since it uses as much as digits as its factorization.

221131332091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 221131332091 in words is "two hundred twenty-one billion, one hundred thirty-one million, three hundred thirty-two thousand, ninety-one".