100220221 has 4 divisors (see below), whose sum is σ = 100244092. Its totient is φ = 100196352.

The previous prime is 100220213. The next prime is 100220227. The reversal of 100220221 is 122022001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56475225 + 43744996 = 7515^2 + 6614^2 .

It is a cyclic number.

It is not a de Polignac number, because 100220221 - 2³ = 100220213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100220198 and 100220207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100220227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3780 + ... + 14653.

It is an arithmetic number, because the mean of its divisors is an integer number (25061023).

Almost surely, 2^100220221 is an apocalyptic number.

It is an amenable number.

100220221 is a deficient number, since it is larger than the sum of its proper divisors (23871).

100220221 is an equidigital number, since it uses as much as digits as its factorization.

100220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23870.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 100220221 is about 10011.0049945048. The cubic root of 100220221 is about 464.4993586623.

Adding to 100220221 its reverse (122022001), we get a palindrome (222242222).

The spelling of 100220221 in words is "one hundred million, two hundred twenty thousand, two hundred twenty-one".