100220081 has 8 divisors (see below), whose sum is σ = 108143784. Its totient is φ = 92327040.

The previous prime is 100220077. The next prime is 100220089. The reversal of 100220081 is 180022001.

It can be written as a sum of positive squares in 4 ways, for example, as 40000 + 100180081 = 200^2 + 10009^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100220081 - 2² = 100220077 is a prime.

It is a super-2 number, since 2×100220081² = 20088129271293122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100220089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 626 + ... + 14171.

It is an arithmetic number, because the mean of its divisors is an integer number (13517973).

Almost surely, 2^100220081 is an apocalyptic number.

It is an amenable number.

100220081 is a deficient number, since it is larger than the sum of its proper divisors (7923703).

100220081 is a wasteful number, since it uses less digits than its factorization.

100220081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15331.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 100220081 is about 10010.9980021974. The cubic root of 100220081 is about 464.4991423721.

Adding to 100220081 its reverse (180022001), we get a palindrome (280242082).

The spelling of 100220081 in words is "one hundred million, two hundred twenty thousand, eighty-one".