100400432221 has 4 divisors (see below), whose sum is σ = 100436957500. Its totient is φ = 100363906944.

The previous prime is 100400432207. The next prime is 100400432257. The reversal of 100400432221 is 122234004001.

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 53337902500 + 47062529721 = 230950^2 + 216939^2 .

It is a cyclic number.

It is not a de Polignac number, because 100400432221 - 2²³ = 100392043613 is a prime.

It is a super-2 number, since 2×100400432221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100400432281) 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, 18258516 + ... + 18264013.

It is an arithmetic number, because the mean of its divisors is an integer number (25109239375).

Almost surely, 2^100400432221 is an apocalyptic number.

It is an amenable number.

100400432221 is a deficient number, since it is larger than the sum of its proper divisors (36525279).

100400432221 is an equidigital number, since it uses as much as digits as its factorization.

100400432221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36525278.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 100400432221 its reverse (122234004001), we get a palindrome (222634436222).

The spelling of 100400432221 in words is "one hundred billion, four hundred million, four hundred thirty-two thousand, two hundred twenty-one".