100721286 has 32 divisors (see below), whose sum is σ = 225217920. Its totient is φ = 33364872.

The previous prime is 100721281. The next prime is 100721317. The reversal of 100721286 is 682127001.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100721281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3081 + ... + 14523.

It is an arithmetic number, because the mean of its divisors is an integer number (7038060).

Almost surely, 2^100721286 is an apocalyptic number.

100721286 is an abundant number, since it is smaller than the sum of its proper divisors (124496634).

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

100721286 is a wasteful number, since it uses less digits than its factorization.

100721286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11617 (or 11611 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 100721286 is about 10035.9995017935. Note that the first 3 decimals coincide. The cubic root of 100721286 is about 465.2721819617.

Adding to 100721286 its reverse (682127001), we get a palindrome (782848287).

The spelling of 100721286 in words is "one hundred million, seven hundred twenty-one thousand, two hundred eighty-six".