2100021221122 has 48 divisors (see below), whose sum is σ = 3698548352856. Its totient is φ = 890454118400.

The previous prime is 2100021221059. The next prime is 2100021221141. The reversal of 2100021221122 is 2211221200012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1626744642721 + 473276578401 = 1275439^2 + 687951^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2100021221096 and 2100021221105.

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 23 ways as a sum of consecutive naturals, for example, 1793779 + ... + 2723542.

Almost surely, 2^{2100021221122} is an apocalyptic number.

2100021221122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2100021221122 is a deficient number, since it is larger than the sum of its proper divisors (1598527131734).

2100021221122 is a wasteful number, since it uses less digits than its factorization.

2100021221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4517475 (or 4517464 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2100021221122 its reverse (2211221200012), we get a palindrome (4311242421134).

The spelling of 2100021221122 in words is "two trillion, one hundred billion, twenty-one million, two hundred twenty-one thousand, one hundred twenty-two".