221220021110100 has 36 divisors (see below), whose sum is σ = 640063261079424. Its totient is φ = 58992005629280.

The previous prime is 221220021110069. The next prime is 221220021110111. The reversal of 221220021110100 is 1011120022122.

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 221220021110100.

It is a congruent number.

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, 368700034884 + ... + 368700035483.

It is an arithmetic number, because the mean of its divisors is an integer number (17779535029984).

Almost surely, 2^{221220021110100} is an apocalyptic number.

221220021110100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220021110100 is an abundant number, since it is smaller than the sum of its proper divisors (418843239969324).

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

221220021110100 is a wasteful number, since it uses less digits than its factorization.

221220021110100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737400070384 (or 737400070377 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221220021110100 its reverse (1011120022122), we get a palindrome (222231141132222).

The spelling of 221220021110100 in words is "two hundred twenty-one trillion, two hundred twenty billion, twenty-one million, one hundred ten thousand, one hundred".