2121020323221 has 8 divisors (see below), whose sum is σ = 2828567746944. Its totient is φ = 1413743224160.

The previous prime is 2121020323217. The next prime is 2121020323241. The reversal of 2121020323221 is 1223230201212.

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 2121020323221 - 2² = 2121020323217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121020323211) 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, 67562856 + ... + 67594241.

It is an arithmetic number, because the mean of its divisors is an integer number (353570968368).

Almost surely, 2^{2121020323221} is an apocalyptic number.

It is an amenable number.

2121020323221 is a deficient number, since it is larger than the sum of its proper divisors (707547423723).

2121020323221 is a wasteful number, since it uses less digits than its factorization.

2121020323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135162331.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 2121020323221 its reverse (1223230201212), we get a palindrome (3344250524433).

The spelling of 2121020323221 in words is "two trillion, one hundred twenty-one billion, twenty million, three hundred twenty-three thousand, two hundred twenty-one".