20212121332221 has 16 divisors (see below), whose sum is σ = 33168609366144. Its totient is φ = 10661338724544.

The previous prime is 20212121332213. The next prime is 20212121332223. The reversal of 20212121332221 is 12223312121202.

It is not a de Polignac number, because 20212121332221 - 2³ = 20212121332213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20212121332191 and 20212121332200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212121332223) 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, 37018536966 + ... + 37018537511.

It is an arithmetic number, because the mean of its divisors is an integer number (2073038085384).

Almost surely, 2^{20212121332221} is an apocalyptic number.

20212121332221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20212121332221 is a deficient number, since it is larger than the sum of its proper divisors (12956488033923).

20212121332221 is a wasteful number, since it uses less digits than its factorization.

20212121332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74037074500.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 20212121332221 its reverse (12223312121202), we get a palindrome (32435433453423).

The spelling of 20212121332221 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, three hundred thirty-two thousand, two hundred twenty-one".