2111012021221 has 16 divisors (see below), whose sum is σ = 2144163385728. Its totient is φ = 2078105976000.

The previous prime is 2111012021219. The next prime is 2111012021263. The reversal of 2111012021221 is 1221202101112.

It is a cyclic number.

It is not a de Polignac number, because 2111012021221 - 2¹ = 2111012021219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111012021195 and 2111012021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111012021021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108341746 + ... + 108361228.

It is an arithmetic number, because the mean of its divisors is an integer number (134010211608).

Almost surely, 2^{2111012021221} is an apocalyptic number.

It is an amenable number.

2111012021221 is a deficient number, since it is larger than the sum of its proper divisors (33151364507).

2111012021221 is a wasteful number, since it uses less digits than its factorization.

2111012021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25692.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2111012021221 its reverse (1221202101112), we get a palindrome (3332214122333).

It can be divided in two parts, 211101 and 2021221, that added together give a palindrome (2232322).

The spelling of 2111012021221 in words is "two trillion, one hundred eleven billion, twelve million, twenty-one thousand, two hundred twenty-one".