100321620 has 72 divisors (see below), whose sum is σ = 326771424. Its totient is φ = 22929984.

The previous prime is 100321609. The next prime is 100321621. The reversal of 100321620 is 26123001.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 100321620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100321621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14122 + ... + 20001.

It is an arithmetic number, because the mean of its divisors is an integer number (4538492).

Almost surely, 2^100321620 is an apocalyptic number.

100321620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100321620 is an abundant number, since it is smaller than the sum of its proper divisors (226449804).

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

100321620 is a wasteful number, since it uses less digits than its factorization.

100321620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34149 (or 34140 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 100321620 is about 10016.0680908229. The cubic root of 100321620 is about 464.6559601090.

Adding to 100321620 its reverse (26123001), we get a palindrome (126444621).

It can be divided in two parts, 1003216 and 20, that added together give a triangular number (1003236 = T₁₄₁₆).

The spelling of 100321620 in words is "one hundred million, three hundred twenty-one thousand, six hundred twenty".