201220221100100 has 36 divisors (see below), whose sum is σ = 437003167181700. Its totient is φ = 80422597676160.

The previous prime is 201220221100009. The next prime is 201220221100127. The reversal of 201220221100100 is 1001122022102.

It can be written as a sum of positive squares in 6 ways, for example, as 7521021032704 + 193699200067396 = 2742448^2 + 13917586^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 818511035 + ... + 818756834.

Almost surely, 2^{201220221100100} is an apocalyptic number.

201220221100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201220221100100 is an abundant number, since it is smaller than the sum of its proper divisors (235782946081600).

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

201220221100100 is a wasteful number, since it uses less digits than its factorization.

201220221100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637269112 (or 1637269105 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201220221100100 its reverse (1001122022102), we get a palindrome (202221343122202).

The spelling of 201220221100100 in words is "two hundred one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred thousand, one hundred".