2102212121021 has 8 divisors (see below), whose sum is σ = 2104185027264. Its totient is φ = 2100239396640.

The previous prime is 2102212120963. The next prime is 2102212121083. The reversal of 2102212121021 is 1201212122012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102212121021 is a prime.

It is a super-2 number, since 2×2102212121021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102212129021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36903641 + ... + 36960561.

It is an arithmetic number, because the mean of its divisors is an integer number (263023128408).

Almost surely, 2^{2102212121021} is an apocalyptic number.

It is an amenable number.

2102212121021 is a deficient number, since it is larger than the sum of its proper divisors (1972906243).

2102212121021 is a wasteful number, since it uses less digits than its factorization.

2102212121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90931.

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

Adding to 2102212121021 its reverse (1201212122012), we get a palindrome (3303424243033).

Subtracting from 2102212121021 its reverse (1201212122012), we obtain a palindrome (900999999009).

The spelling of 2102212121021 in words is "two trillion, one hundred two billion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".