20211222012100 has 72 divisors (see below), whose sum is σ = 50127301022400. Its totient is φ = 6929082049920.

The previous prime is 20211222012067. The next prime is 20211222012139. The reversal of 20211222012100 is 121022211202.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9192027 + ... + 11176573.

It is an arithmetic number, because the mean of its divisors is an integer number (696212514200).

Almost surely, 2^{20211222012100} is an apocalyptic number.

20211222012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211222012100 is an abundant number, since it is smaller than the sum of its proper divisors (29916079010300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20211222012100 is a wasteful number, since it uses less digits than its factorization.

20211222012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999117 (or 1999110 counting only the distinct ones).

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

Adding to 20211222012100 its reverse (121022211202), we get a palindrome (20332244223302).

The spelling of 20211222012100 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-two million, twelve thousand, one hundred".