100421320 has 16 divisors (see below), whose sum is σ = 225948060. Its totient is φ = 40168512.

The previous prime is 100421317. The next prime is 100421323. The reversal of 100421320 is 23124001.

It is an interprime number because it is at equal distance from previous prime (100421317) and next prime (100421323).

It can be written as a sum of positive squares in 2 ways, for example, as 95140516 + 5280804 = 9754^2 + 2298^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 100421320.

It is not an unprimeable number, because it can be changed into a prime (100421323) 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, 1255227 + ... + 1255306.

Almost surely, 2^100421320 is an apocalyptic number.

100421320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100421320 is an abundant number, since it is smaller than the sum of its proper divisors (125526740).

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

100421320 is a wasteful number, since it uses less digits than its factorization.

100421320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2510544 (or 2510540 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 100421320 is about 10021.0438578024. The cubic root of 100421320 is about 464.8098347551.

Adding to 100421320 its reverse (23124001), we get a palindrome (123545321).

The spelling of 100421320 in words is "one hundred million, four hundred twenty-one thousand, three hundred twenty".