21123232122 has 64 divisors (see below), whose sum is σ = 45141110784. Its totient is φ = 6566511360.

The previous prime is 21123232099. The next prime is 21123232133. The reversal of 21123232122 is 22123232112.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5161297 + ... + 5165387.

It is an arithmetic number, because the mean of its divisors is an integer number (705329856).

Almost surely, 2^21123232122 is an apocalyptic number.

21123232122 is an abundant number, since it is smaller than the sum of its proper divisors (24017878662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123232122 is a wasteful number, since it uses less digits than its factorization.

21123232122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4563.

The product of its digits is 576, while the sum is 21.

Adding to 21123232122 its reverse (22123232112), we get a palindrome (43246464234).

The spelling of 21123232122 in words is "twenty-one billion, one hundred twenty-three million, two hundred thirty-two thousand, one hundred twenty-two".