20212122022221 has 8 divisors (see below), whose sum is σ = 26950590257344. Its totient is φ = 13474200900960.

The previous prime is 20212122022151. The next prime is 20212122022237. The reversal of 20212122022221 is 12222022121202.

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

It is not a de Polignac number, because 20212122022221 - 2¹⁹ = 20212121497933 is a prime.

It is a super-2 number, since 2×20212122022221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212122022021) 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, 136692256 + ... + 136840041.

It is an arithmetic number, because the mean of its divisors is an integer number (3368823782168).

Almost surely, 2^{20212122022221} is an apocalyptic number.

It is an amenable number.

20212122022221 is a deficient number, since it is larger than the sum of its proper divisors (6738468235123).

20212122022221 is a wasteful number, since it uses less digits than its factorization.

20212122022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273556931.

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

Adding to 20212122022221 its reverse (12222022121202), we get a palindrome (32434144143423).

The spelling of 20212122022221 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-two million, twenty-two thousand, two hundred twenty-one".