20012221122021 has 12 divisors (see below), whose sum is σ = 28915011205548. Its totient is φ = 13337571708864.

The previous prime is 20012221122017. The next prime is 20012221122041. The reversal of 20012221122021 is 12022112221002.

It is a happy number.

20012221122021 is a `hidden beast` number, since 200 + 1 + 2 + 221 + 1 + 220 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18901756188225 + 1110464933796 = 4347615^2 + 1053786^2 .

It is not a de Polignac number, because 20012221122021 - 2² = 20012221122017 is a prime.

It is a super-2 number, since 2×20012221122021² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20012221121985 and 20012221122003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012221122001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325720840 + ... + 325782273.

It is an arithmetic number, because the mean of its divisors is an integer number (2409584267129).

Almost surely, 2^{20012221122021} is an apocalyptic number.

It is an amenable number.

20012221122021 is a deficient number, since it is larger than the sum of its proper divisors (8902790083527).

20012221122021 is a wasteful number, since it uses less digits than its factorization.

20012221122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651506532 (or 651506529 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20012221122021 its reverse (12022112221002), we get a palindrome (32034333343023).

The spelling of 20012221122021 in words is "twenty trillion, twelve billion, two hundred twenty-one million, one hundred twenty-two thousand, twenty-one".