2102212220121 has 12 divisors (see below), whose sum is σ = 3270107898148. Its totient is φ = 1293669058464.

The previous prime is 2102212220117. The next prime is 2102212220123. The reversal of 2102212220121 is 1210222122012.

It is a happy number.

2102212220121 is a `hidden beast` number, since 210 + 2 + 212 + 220 + 1 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1041746835600 + 1060465384521 = 1020660^2 + 1029789^2 .

It is not a de Polignac number, because 2102212220121 - 2² = 2102212220117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2102212220094 and 2102212220103.

It is not an unprimeable number, because it can be changed into a prime (2102212220123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8983812790 + ... + 8983813023.

Almost surely, 2^{2102212220121} is an apocalyptic number.

It is an amenable number.

2102212220121 is a deficient number, since it is larger than the sum of its proper divisors (1167895678027).

2102212220121 is a wasteful number, since it uses less digits than its factorization.

2102212220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17967625832 (or 17967625829 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2102212220121 its reverse (1210222122012), we get a palindrome (3312434342133).

It can be divided in two parts, 210221 and 2220121, that added together give a palindrome (2430342).

The spelling of 2102212220121 in words is "two trillion, one hundred two billion, two hundred twelve million, two hundred twenty thousand, one hundred twenty-one".