221212021011100 has 36 divisors (see below), whose sum is σ = 548605812109264. Its totient is φ = 75844121489280.

The previous prime is 221212021011097. The next prime is 221212021011101. The reversal of 221212021011100 is 1110120212122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212021011101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158008585737 + ... + 158008587136.

Almost surely, 2^{221212021011100} is an apocalyptic number.

221212021011100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212021011100 is an abundant number, since it is smaller than the sum of its proper divisors (327393791098164).

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

221212021011100 is a wasteful number, since it uses less digits than its factorization.

221212021011100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316017172894 (or 316017172887 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221212021011100 its reverse (1110120212122), we get a palindrome (222322141223222).

The spelling of 221212021011100 in words is "two hundred twenty-one trillion, two hundred twelve billion, twenty-one million, eleven thousand, one hundred".