20212202221 has 4 divisors (see below), whose sum is σ = 20226548700. Its totient is φ = 20197855744.

The previous prime is 20212202201. The next prime is 20212202237. The reversal of 20212202221 is 12220221202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8951808996 + 11260393225 = 94614^2 + 106115^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212202221 - 2⁵ = 20212202189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212202195 and 20212202204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212202201) 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, 7171126 + ... + 7173943.

It is an arithmetic number, because the mean of its divisors is an integer number (5056637175).

Almost surely, 2^20212202221 is an apocalyptic number.

It is an amenable number.

20212202221 is a deficient number, since it is larger than the sum of its proper divisors (14346479).

20212202221 is a wasteful number, since it uses less digits than its factorization.

20212202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14346478.

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

Adding to 20212202221 its reverse (12220221202), we get a palindrome (32432423423).

The spelling of 20212202221 in words is "twenty billion, two hundred twelve million, two hundred two thousand, two hundred twenty-one".