21122343091 has 2 divisors, whose sum is σ = 21122343092. Its totient is φ = 21122343090.

The previous prime is 21122343061. The next prime is 21122343097. The reversal of 21122343091 is 19034322112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21122343091 - 2¹⁵ = 21122310323 is a prime.

It is not a weakly prime, because it can be changed into another prime (21122343097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561171545 + 10561171546.

It is an arithmetic number, because the mean of its divisors is an integer number (10561171546).

Almost surely, 2^21122343091 is an apocalyptic number.

21122343091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122343091 is an equidigital number, since it uses as much as digits as its factorization.

21122343091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21122343091 in words is "twenty-one billion, one hundred twenty-two million, three hundred forty-three thousand, ninety-one".