2220121221 has 8 divisors (see below), whose sum is σ = 2960397024. Its totient is φ = 1479963120.

The previous prime is 2220121219. The next prime is 2220121237. The reversal of 2220121221 is 1221210222.

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

It is not a de Polignac number, because 2220121221 - 2¹ = 2220121219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2220121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220121201) 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, 34315 + ... + 74951.

It is an arithmetic number, because the mean of its divisors is an integer number (370049628).

Almost surely, 2^2220121221 is an apocalyptic number.

It is an amenable number.

2220121221 is a deficient number, since it is larger than the sum of its proper divisors (740275803).

2220121221 is a wasteful number, since it uses less digits than its factorization.

2220121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58851.

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

The square root of 2220121221 is about 47118.1623262198. The cubic root of 2220121221 is about 1304.5444936288.

Adding to 2220121221 its reverse (1221210222), we get a palindrome (3441331443).

The spelling of 2220121221 in words is "two billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".