21123223221099 has 32 divisors (see below), whose sum is σ = 29909892648960. Its totient is φ = 13231412697888.

The previous prime is 21123223221019. The next prime is 21123223221161. The reversal of 21123223221099 is 99012232232112.

It is not a de Polignac number, because 21123223221099 - 2⁹ = 21123223220587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21123223221019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3313452 + ... + 7295574.

It is an arithmetic number, because the mean of its divisors is an integer number (934684145280).

Almost surely, 2^{21123223221099} is an apocalyptic number.

21123223221099 is a deficient number, since it is larger than the sum of its proper divisors (8786669427861).

21123223221099 is a wasteful number, since it uses less digits than its factorization.

21123223221099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3983511.

The product of its (nonzero) digits is 46656, while the sum is 39.

The spelling of 21123223221099 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred twenty-three million, two hundred twenty-one thousand, ninety-nine".