20011222021021 has 32 divisors (see below), whose sum is σ = 24980830617600. Its totient is φ = 15573313601280.

The previous prime is 20011222021013. The next prime is 20011222021181. The reversal of 20011222021021 is 12012022211002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20011222021021 - 2³ = 20011222021013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011222020986 and 20011222021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011222021001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 194851141 + ... + 194953813.

It is an arithmetic number, because the mean of its divisors is an integer number (780650956800).

Almost surely, 2^{20011222021021} is an apocalyptic number.

It is an amenable number.

20011222021021 is a deficient number, since it is larger than the sum of its proper divisors (4969608596579).

20011222021021 is a wasteful number, since it uses less digits than its factorization.

20011222021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105889.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20011222021021 its reverse (12012022211002), we get a palindrome (32023244232023).

The spelling of 20011222021021 in words is "twenty trillion, eleven billion, two hundred twenty-two million, twenty-one thousand, twenty-one".