20011222222021 has 8 divisors (see below), whose sum is σ = 20629869614424. Its totient is φ = 19398792391680.

The previous prime is 20011222221961. The next prime is 20011222222049. The reversal of 20011222222021 is 12022222211002.

It can be written as a sum of positive squares in 4 ways, for example, as 406597522500 + 19604624699521 = 637650^2 + 4427711^2 .

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 20011222222021 - 2³⁹ = 19461466408133 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 20011222222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011222222051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1554383980 + ... + 1554396853.

It is an arithmetic number, because the mean of its divisors is an integer number (2578733701803).

Almost surely, 2^{20011222222021} is an apocalyptic number.

It is an amenable number.

20011222222021 is a deficient number, since it is larger than the sum of its proper divisors (618647392403).

20011222222021 is a wasteful number, since it uses less digits than its factorization.

20011222222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3108781031.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20011222222021 its reverse (12022222211002), we get a palindrome (32033444433023).

The spelling of 20011222222021 in words is "twenty trillion, eleven billion, two hundred twenty-two million, two hundred twenty-two thousand, twenty-one".