20212202212221 has 16 divisors (see below), whose sum is σ = 26965186706304. Its totient is φ = 13467011625984.

The previous prime is 20212202212171. The next prime is 20212202212243. The reversal of 20212202212221 is 12221220221202.

It is not a de Polignac number, because 20212202212221 - 2³⁰ = 20211128470397 is a prime.

It is a super-2 number, since 2×20212202212221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212202212261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40206400 + ... + 40706006.

It is an arithmetic number, because the mean of its divisors is an integer number (1685324169144).

Almost surely, 2^{20212202212221} is an apocalyptic number.

It is an amenable number.

20212202212221 is a deficient number, since it is larger than the sum of its proper divisors (6752984494083).

20212202212221 is a wasteful number, since it uses less digits than its factorization.

20212202212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507380.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 20212202212221 its reverse (12221220221202), we get a palindrome (32433422433423).

The spelling of 20212202212221 in words is "twenty trillion, two hundred twelve billion, two hundred two million, two hundred twelve thousand, two hundred twenty-one".