2122021221 has 8 divisors (see below), whose sum is σ = 2830920960. Its totient is φ = 1413901152.

The previous prime is 2122021219. The next prime is 2122021229. The reversal of 2122021221 is 1221202212.

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

It is not a de Polignac number, because 2122021221 - 2¹ = 2122021219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2122021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122021229) 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, 188536 + ... + 199473.

It is an arithmetic number, because the mean of its divisors is an integer number (353865120).

Almost surely, 2^2122021221 is an apocalyptic number.

It is an amenable number.

2122021221 is a deficient number, since it is larger than the sum of its proper divisors (708899739).

2122021221 is a wasteful number, since it uses less digits than its factorization.

2122021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389835.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2122021221 is about 46065.4015612585. The cubic root of 2122021221 is about 1285.0397866024.

Adding to 2122021221 its reverse (1221202212), we get a palindrome (3343223433).

The spelling of 2122021221 in words is "two billion, one hundred twenty-two million, twenty-one thousand, two hundred twenty-one".