220400101 has 4 divisors (see below), whose sum is σ = 220429804. Its totient is φ = 220370400.

The previous prime is 220400077. The next prime is 220400107. The reversal of 220400101 is 101004022.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 82901025 + 137499076 = 9105^2 + 11726^2 .

It is a cyclic number.

It is not a de Polignac number, because 220400101 - 2⁷ = 220399973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220400107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6841 + ... + 22081.

It is an arithmetic number, because the mean of its divisors is an integer number (55107451).

Almost surely, 2^220400101 is an apocalyptic number.

It is an amenable number.

220400101 is a deficient number, since it is larger than the sum of its proper divisors (29703).

220400101 is a wasteful number, since it uses less digits than its factorization.

220400101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29702.

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

The square root of 220400101 is about 14845.8782495344. The cubic root of 220400101 is about 604.0468117528.

Adding to 220400101 its reverse (101004022), we get a palindrome (321404123).

The spelling of 220400101 in words is "two hundred twenty million, four hundred thousand, one hundred one".