2222021221 has 16 divisors (see below), whose sum is σ = 2561606784. Its totient is φ = 1888015104.

The previous prime is 2222021213. The next prime is 2222021233. The reversal of 2222021221 is 1221202222.

It is a cyclic number.

It is not a de Polignac number, because 2222021221 - 2³ = 2222021213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2222021195 and 2222021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222021251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 989526 + ... + 991768.

It is an arithmetic number, because the mean of its divisors is an integer number (160100424).

Almost surely, 2^2222021221 is an apocalyptic number.

It is an amenable number.

2222021221 is a deficient number, since it is larger than the sum of its proper divisors (339585563).

2222021221 is a wasteful number, since it uses less digits than its factorization.

2222021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3420.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2222021221 is about 47138.3200909833. The cubic root of 2222021221 is about 1304.9165345443.

Adding to 2222021221 its reverse (1221202222), we get a palindrome (3443223443).

The spelling of 2222021221 in words is "two billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty-one".