20000022221 has 4 divisors (see below), whose sum is σ = 20001121632. Its totient is φ = 19998922812.

The previous prime is 20000022199. The next prime is 20000022227. The reversal of 20000022221 is 12222000002.

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 a de Polignac number, because none of the positive numbers 2^k-20000022221 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 (20000022227) 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, 521951 + ... + 558956.

It is an arithmetic number, because the mean of its divisors is an integer number (5000280408).

Almost surely, 2^20000022221 is an apocalyptic number.

It is an amenable number.

20000022221 is a deficient number, since it is larger than the sum of its proper divisors (1099411).

20000022221 is a wasteful number, since it uses less digits than its factorization.

20000022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099410.

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 20000022221 its reverse (12222000002), we get a palindrome (32222022223).

The spelling of 20000022221 in words is "twenty billion, twenty-two thousand, two hundred twenty-one".