21121093099 has 2 divisors, whose sum is σ = 21121093100. Its totient is φ = 21121093098.

The previous prime is 21121093093. The next prime is 21121093109. The reversal of 21121093099 is 99039012112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21121093099 - 2⁵ = 21121093067 is a prime.

It is a super-2 number, since 2×21121093099² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21121093093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560546549 + 10560546550.

It is an arithmetic number, because the mean of its divisors is an integer number (10560546550).

Almost surely, 2^21121093099 is an apocalyptic number.

21121093099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121093099 is an equidigital number, since it uses as much as digits as its factorization.

21121093099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 37.

The spelling of 21121093099 in words is "twenty-one billion, one hundred twenty-one million, ninety-three thousand, ninety-nine".