20102222221 has 4 divisors (see below), whose sum is σ = 20148013600. Its totient is φ = 20056430844.

The previous prime is 20102222209. The next prime is 20102222251. The reversal of 20102222221 is 12222220102.

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 20102222221 - 2⁷ = 20102222093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102222195 and 20102222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102222201) 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, 22895031 + ... + 22895908.

It is an arithmetic number, because the mean of its divisors is an integer number (5037003400).

Almost surely, 2^20102222221 is an apocalyptic number.

It is an amenable number.

20102222221 is a deficient number, since it is larger than the sum of its proper divisors (45791379).

20102222221 is an equidigital number, since it uses as much as digits as its factorization.

20102222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45791378.

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

Adding to 20102222221 its reverse (12222220102), we get a palindrome (32324442323).

The spelling of 20102222221 in words is "twenty billion, one hundred two million, two hundred twenty-two thousand, two hundred twenty-one".