2121662202221 has 8 divisors (see below), whose sum is σ = 2172793017120. Its totient is φ = 2070612743472.

The previous prime is 2121662202199. The next prime is 2121662202223. The reversal of 2121662202221 is 1222022661212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2121662202221 - 2²⁶ = 2121595093357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121662202223) 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, 20286251 + ... + 20390568.

It is an arithmetic number, because the mean of its divisors is an integer number (271599127140).

Almost surely, 2^{2121662202221} is an apocalyptic number.

It is an amenable number.

2121662202221 is a deficient number, since it is larger than the sum of its proper divisors (51130814899).

2121662202221 is a wasteful number, since it uses less digits than its factorization.

2121662202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40678075.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 2121662202221 its reverse (1222022661212), we get a palindrome (3343684863433).

The spelling of 2121662202221 in words is "two trillion, one hundred twenty-one billion, six hundred sixty-two million, two hundred two thousand, two hundred twenty-one".