21031122122 has 16 divisors (see below), whose sum is σ = 33807964032. Its totient is φ = 9786514320.

The previous prime is 21031122061. The next prime is 21031122181. The reversal of 21031122122 is 22122113012.

It is a self number, because there is not a number n which added to its sum of digits gives 21031122122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6176654 + ... + 6180057.

It is an arithmetic number, because the mean of its divisors is an integer number (2112997752).

Almost surely, 2^21031122122 is an apocalyptic number.

21031122122 is a deficient number, since it is larger than the sum of its proper divisors (12776841910).

21031122122 is a wasteful number, since it uses less digits than its factorization.

21031122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12356773.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21031122122 its reverse (22122113012), we get a palindrome (43153235134).

The spelling of 21031122122 in words is "twenty-one billion, thirty-one million, one hundred twenty-two thousand, one hundred twenty-two".