21112122109499 has 2 divisors, whose sum is σ = 21112122109500. Its totient is φ = 21112122109498.

The previous prime is 21112122109471. The next prime is 21112122109531. The reversal of 21112122109499 is 99490122121112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112122109499 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112122109699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556061054749 + 10556061054750.

It is an arithmetic number, because the mean of its divisors is an integer number (10556061054750).

Almost surely, 2^{21112122109499} is an apocalyptic number.

21112122109499 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112122109499 is an equidigital number, since it uses as much as digits as its factorization.

21112122109499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 44.

The spelling of 21112122109499 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-two million, one hundred nine thousand, four hundred ninety-nine".