20212110120221 has 4 divisors (see below), whose sum is σ = 20212128341244. Its totient is φ = 20212091899200.

The previous prime is 20212110120187. The next prime is 20212110120317. The reversal of 20212110120221 is 12202101121202.

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 18099825763321 + 2112284356900 = 4254389^2 + 1453370^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212110120221 - 2²² = 20212105925917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20212110120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212110180221) 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, 7330700 + ... + 9703781.

It is an arithmetic number, because the mean of its divisors is an integer number (5053032085311).

Almost surely, 2^{20212110120221} is an apocalyptic number.

It is an amenable number.

20212110120221 is a deficient number, since it is larger than the sum of its proper divisors (18221023).

20212110120221 is a wasteful number, since it uses less digits than its factorization.

20212110120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18221022.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20212110120221 its reverse (12202101121202), we get a palindrome (32414211241423).

The spelling of 20212110120221 in words is "twenty trillion, two hundred twelve billion, one hundred ten million, one hundred twenty thousand, two hundred twenty-one".