221201211110100 has 144 divisors (see below), whose sum is σ = 691693102349760. Its totient is φ = 54255758054400.

The previous prime is 221201211110069. The next prime is 221201211110129. The reversal of 221201211110100 is 1011112102122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221201211110100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 99826270 + ... + 102018069.

Almost surely, 2^{221201211110100} is an apocalyptic number.

221201211110100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201211110100 is an abundant number, since it is smaller than the sum of its proper divisors (470491891239660).

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

221201211110100 is a wasteful number, since it uses less digits than its factorization.

221201211110100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201844650 (or 201844643 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221201211110100 its reverse (1011112102122), we get a palindrome (222212323212222).

The spelling of 221201211110100 in words is "two hundred twenty-one trillion, two hundred one billion, two hundred eleven million, one hundred ten thousand, one hundred".