100321020 has 36 divisors (see below), whose sum is σ = 304307640. Its totient is φ = 26752224.

The previous prime is 100321003. The next prime is 100321037. The reversal of 100321020 is 20123001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (100321003) and next prime (100321037).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 100320993 and 100321011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 278490 + ... + 278849.

It is an arithmetic number, because the mean of its divisors is an integer number (8452990).

Almost surely, 2^100321020 is an apocalyptic number.

100321020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100321020 is an abundant number, since it is smaller than the sum of its proper divisors (203986620).

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

100321020 is a wasteful number, since it uses less digits than its factorization.

100321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557354 (or 557349 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 100321020 is about 10016.0381389050. The cubic root of 100321020 is about 464.6550337745.

Adding to 100321020 its reverse (20123001), we get a palindrome (120444021).

The spelling of 100321020 in words is "one hundred million, three hundred twenty-one thousand, twenty".