221031020100 has 72 divisors (see below), whose sum is σ = 697654284768. Its totient is φ = 53583276800.

The previous prime is 221031020059. The next prime is 221031020101. The reversal of 221031020100 is 1020130122.

It is a super-3 number, since 3×221031020100³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (221031020101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33486249 + ... + 33492848.

It is an arithmetic number, because the mean of its divisors is an integer number (9689642844).

Almost surely, 2^221031020100 is an apocalyptic number.

221031020100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221031020100 is an abundant number, since it is smaller than the sum of its proper divisors (476623264668).

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

221031020100 is a wasteful number, since it uses less digits than its factorization.

221031020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66979125 (or 66979118 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 221031020100 its reverse (1020130122), we get a palindrome (222051150222).

The spelling of 221031020100 in words is "two hundred twenty-one billion, thirty-one million, twenty thousand, one hundred".