21210121111122 has 12 divisors (see below), whose sum is σ = 45955262407470. Its totient is φ = 7070040370368.

The previous prime is 21210121111097. The next prime is 21210121111163. The reversal of 21210121111122 is 22111112101212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15606679379841 + 5603441731281 = 3950529^2 + 2367159^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1178340061729 = 21210121111122 / (2 + 1 + 2 + 1 + 0 + 1 + 2 + 1 + 1 + 1 + 1 + 1 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21210121111095 and 21210121111104.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 589170030847 + ... + 589170030882.

Almost surely, 2^{21210121111122} is an apocalyptic number.

21210121111122 is an abundant number, since it is smaller than the sum of its proper divisors (24745141296348).

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

21210121111122 is a wasteful number, since it uses less digits than its factorization.

21210121111122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178340061737 (or 1178340061734 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21210121111122 its reverse (22111112101212), we get a palindrome (43321233212334).

The spelling of 21210121111122 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty-two".