20212221222221 has 8 divisors (see below), whose sum is σ = 24315454102080. Its totient is φ = 16412931518688.

The previous prime is 20212221222143. The next prime is 20212221222269. The reversal of 20212221222221 is 12222212221202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20212221222221 - 2¹⁴ = 20212221205837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212221242221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75985793936 + ... + 75985794201.

It is an arithmetic number, because the mean of its divisors is an integer number (3039431762760).

Almost surely, 2^{20212221222221} is an apocalyptic number.

It is an amenable number.

20212221222221 is a deficient number, since it is larger than the sum of its proper divisors (4103232879859).

20212221222221 is a wasteful number, since it uses less digits than its factorization.

20212221222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151971588163.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 20212221222221 its reverse (12222212221202), we get a palindrome (32434433443423).

The spelling of 20212221222221 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".