21231122122 has 16 divisors (see below), whose sum is σ = 36413850240. Its totient is φ = 9094642128.

The previous prime is 21231122071. The next prime is 21231122137. The reversal of 21231122122 is 22122113212.

It is a self number, because there is not a number n which added to its sum of digits gives 21231122122.

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 7 ways as a sum of consecutive naturals, for example, 337518 + ... + 395449.

It is an arithmetic number, because the mean of its divisors is an integer number (2275865640).

Almost surely, 2^21231122122 is an apocalyptic number.

21231122122 is a deficient number, since it is larger than the sum of its proper divisors (15182728118).

21231122122 is a wasteful number, since it uses less digits than its factorization.

21231122122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735045.

The product of its digits is 192, while the sum is 19.

Adding to 21231122122 its reverse (22122113212), we get a palindrome (43353235334).

The spelling of 21231122122 in words is "twenty-one billion, two hundred thirty-one million, one hundred twenty-two thousand, one hundred twenty-two".