21113002091 has 2 divisors, whose sum is σ = 21113002092. Its totient is φ = 21113002090.

The previous prime is 21113001991. The next prime is 21113002133. The reversal of 21113002091 is 19020031112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21113002091 - 2²² = 21108807787 is a prime.

It is not a weakly prime, because it can be changed into another prime (21113002591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556501045 + 10556501046.

It is an arithmetic number, because the mean of its divisors is an integer number (10556501046).

Almost surely, 2^21113002091 is an apocalyptic number.

21113002091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113002091 is an equidigital number, since it uses as much as digits as its factorization.

21113002091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 21113002091 in words is "twenty-one billion, one hundred thirteen million, two thousand, ninety-one".