2101220121212 has 12 divisors (see below), whose sum is σ = 3677710798440. Its totient is φ = 1050445607376.

The previous prime is 2101220121173. The next prime is 2101220121239. The reversal of 2101220121212 is 2121210221012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41084558 + ... + 41135669.

It is an arithmetic number, because the mean of its divisors is an integer number (306475899870).

Almost surely, 2^{2101220121212} is an apocalyptic number.

It is an amenable number.

2101220121212 is a deficient number, since it is larger than the sum of its proper divisors (1576490677228).

2101220121212 is a wasteful number, since it uses less digits than its factorization.

2101220121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82226620 (or 82226618 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2101220121212 its reverse (2121210221012), we get a palindrome (4222430342224).

The spelling of 2101220121212 in words is "two trillion, one hundred one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twelve".