221201031100 has 72 divisors (see below), whose sum is σ = 561958594848. Its totient is φ = 73990579200.

The previous prime is 221201031067. The next prime is 221201031157. The reversal of 221201031100 is 1130102122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3824977 + ... + 3882376.

It is an arithmetic number, because the mean of its divisors is an integer number (7804980484).

Almost surely, 2^221201031100 is an apocalyptic number.

221201031100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201031100 is an abundant number, since it is smaller than the sum of its proper divisors (340757563748).

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

221201031100 is a wasteful number, since it uses less digits than its factorization.

221201031100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7707415 (or 7707408 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 221201031100 its reverse (1130102122), we get a palindrome (222331133222).

The spelling of 221201031100 in words is "two hundred twenty-one billion, two hundred one million, thirty-one thousand, one hundred".