20001221112022 has 4 divisors (see below), whose sum is σ = 30001831668036. Its totient is φ = 10000610556010.

The previous prime is 20001221112017. The next prime is 20001221112031. The reversal of 20001221112022 is 22021112210002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 20001221111987 and 20001221112005.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5000305278004 + ... + 5000305278007.

It is an arithmetic number, because the mean of its divisors is an integer number (7500457917009).

Almost surely, 2^{20001221112022} is an apocalyptic number.

20001221112022 is a deficient number, since it is larger than the sum of its proper divisors (10000610556014).

20001221112022 is a wasteful number, since it uses less digits than its factorization.

20001221112022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10000610556013.

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

Adding to 20001221112022 its reverse (22021112210002), we get a palindrome (42022333322024).

The spelling of 20001221112022 in words is "twenty trillion, one billion, two hundred twenty-one million, one hundred twelve thousand, twenty-two".