100221420 has 48 divisors (see below), whose sum is σ = 302208480. Its totient is φ = 24669696.

The previous prime is 100221389. The next prime is 100221427. The reversal of 100221420 is 24122001.

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

It is a junction number, because it is equal to n+sod(n) for n = 100221396 and 100221405.

It is not an unprimeable number, because it can be changed into a prime (100221427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63465 + ... + 65024.

It is an arithmetic number, because the mean of its divisors is an integer number (6296010).

Almost surely, 2^100221420 is an apocalyptic number.

100221420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100221420 is an abundant number, since it is smaller than the sum of its proper divisors (201987060).

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

100221420 is a wasteful number, since it uses less digits than its factorization.

100221420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128514 (or 128512 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 100221420 is about 10011.0648784233. The cubic root of 100221420 is about 464.5012110247.

Adding to 100221420 its reverse (24122001), we get a palindrome (124343421).

It can be divided in two parts, 1002 and 21420, that added together give a palindrome (22422).

The spelling of 100221420 in words is "one hundred million, two hundred twenty-one thousand, four hundred twenty".