20211122202221 has 4 divisors (see below), whose sum is σ = 20641146078912. Its totient is φ = 19781098325532.

The previous prime is 20211122202209. The next prime is 20211122202343. The reversal of 20211122202221 is 12220222111202.

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 20211122202221 - 2²⁶ = 20211055093357 is a prime.

It is a super-2 number, since 2×20211122202221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211122202193 and 20211122202202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211122202521) 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, 215011938275 + ... + 215011938368.

It is an arithmetic number, because the mean of its divisors is an integer number (5160286519728).

Almost surely, 2^{20211122202221} is an apocalyptic number.

It is an amenable number.

20211122202221 is a deficient number, since it is larger than the sum of its proper divisors (430023876691).

20211122202221 is an equidigital number, since it uses as much as digits as its factorization.

20211122202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430023876690.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20211122202221 its reverse (12220222111202), we get a palindrome (32431344313423).

The spelling of 20211122202221 in words is "twenty trillion, two hundred eleven billion, one hundred twenty-two million, two hundred two thousand, two hundred twenty-one".