2121022233221 has 16 divisors (see below), whose sum is σ = 2211820512000. Its totient is φ = 2032443137088.

The previous prime is 2121022233199. The next prime is 2121022233247. The reversal of 2121022233221 is 1223322201212.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121022233221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121022233821) 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, 1455146 + ... + 2521803.

It is an arithmetic number, because the mean of its divisors is an integer number (138238782000).

Almost surely, 2^{2121022233221} is an apocalyptic number.

It is an amenable number.

2121022233221 is a deficient number, since it is larger than the sum of its proper divisors (90798278779).

2121022233221 is a wasteful number, since it uses less digits than its factorization.

2121022233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3977228.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 2121022233221 its reverse (1223322201212), we get a palindrome (3344344434433).

The spelling of 2121022233221 in words is "two trillion, one hundred twenty-one billion, twenty-two million, two hundred thirty-three thousand, two hundred twenty-one".