2002122221 has 4 divisors (see below), whose sum is σ = 2184133344. Its totient is φ = 1820111100.

The previous prime is 2002122211. The next prime is 2002122233. The reversal of 2002122221 is 1222212002.

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 2002122221 - 2¹⁰ = 2002121197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2002122196 and 2002122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002122211) 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, 91005545 + ... + 91005566.

It is an arithmetic number, because the mean of its divisors is an integer number (546033336).

Almost surely, 2^2002122221 is an apocalyptic number.

It is an amenable number.

2002122221 is a deficient number, since it is larger than the sum of its proper divisors (182011123).

2002122221 is a wasteful number, since it uses less digits than its factorization.

2002122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182011122.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2002122221 is about 44745.0804111469. The cubic root of 2002122221 is about 1260.3665308489.

Adding to 2002122221 its reverse (1222212002), we get a palindrome (3224334223).

It can be divided in two parts, 2002 and 122221, that multiplied together give a palindrome (244686442).

The spelling of 2002122221 in words is "two billion, two million, one hundred twenty-two thousand, two hundred twenty-one".