21113222202691 has 2 divisors, whose sum is σ = 21113222202692. Its totient is φ = 21113222202690.

The previous prime is 21113222202659. The next prime is 21113222202701. The reversal of 21113222202691 is 19620222231112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21113222202691 - 2⁵ = 21113222202659 is a prime.

It is not a weakly prime, because it can be changed into another prime (21113222202601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556611101345 + 10556611101346.

It is an arithmetic number, because the mean of its divisors is an integer number (10556611101346).

Almost surely, 2^{21113222202691} is an apocalyptic number.

21113222202691 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113222202691 is an equidigital number, since it uses as much as digits as its factorization.

21113222202691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 21113222202691 in words is "twenty-one trillion, one hundred thirteen billion, two hundred twenty-two million, two hundred two thousand, six hundred ninety-one".