20212022221 has 4 divisors (see below), whose sum is σ = 20225616192. Its totient is φ = 20198428252.

The previous prime is 20212022213. The next prime is 20212022231. The reversal of 20212022221 is 12222021202.

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 20212022221 - 2³ = 20212022213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212022195 and 20212022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212022231) 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, 6794755 + ... + 6797728.

It is an arithmetic number, because the mean of its divisors is an integer number (5056404048).

Almost surely, 2^20212022221 is an apocalyptic number.

It is an amenable number.

20212022221 is a deficient number, since it is larger than the sum of its proper divisors (13593971).

20212022221 is a wasteful number, since it uses less digits than its factorization.

20212022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13593970.

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

Adding to 20212022221 its reverse (12222021202), we get a palindrome (32434043423).

The spelling of 20212022221 in words is "twenty billion, two hundred twelve million, twenty-two thousand, two hundred twenty-one".