21233123099 has 4 divisors (see below), whose sum is σ = 21290048736. Its totient is φ = 21176197464.

The previous prime is 21233123057. The next prime is 21233123101. The reversal of 21233123099 is 99032133212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21233123099 - 2¹² = 21233119003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233123999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28462259 + ... + 28463004.

It is an arithmetic number, because the mean of its divisors is an integer number (5322512184).

Almost surely, 2^21233123099 is an apocalyptic number.

21233123099 is a deficient number, since it is larger than the sum of its proper divisors (56925637).

21233123099 is an equidigital number, since it uses as much as digits as its factorization.

21233123099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56925636.

The product of its (nonzero) digits is 17496, while the sum is 35.

The spelling of 21233123099 in words is "twenty-one billion, two hundred thirty-three million, one hundred twenty-three thousand, ninety-nine".