2120212220221 has 4 divisors (see below), whose sum is σ = 2121521803200. Its totient is φ = 2118902637244.

The previous prime is 2120212220213. The next prime is 2120212220233. The reversal of 2120212220221 is 1220222120212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2120212220221 - 2³ = 2120212220213 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 (2120212220201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 654789061 + ... + 654792298.

It is an arithmetic number, because the mean of its divisors is an integer number (530380450800).

Almost surely, 2^{2120212220221} is an apocalyptic number.

It is an amenable number.

2120212220221 is a deficient number, since it is larger than the sum of its proper divisors (1309582979).

2120212220221 is a wasteful number, since it uses less digits than its factorization.

2120212220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309582978.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 2120212220221 its reverse (1220222120212), we get a palindrome (3340434340433).

The spelling of 2120212220221 in words is "two trillion, one hundred twenty billion, two hundred twelve million, two hundred twenty thousand, two hundred twenty-one".