100821572 has 6 divisors (see below), whose sum is σ = 176437758. Its totient is φ = 50410784.

The previous prime is 100821569. The next prime is 100821587. The reversal of 100821572 is 275128001.

It can be written as a sum of positive squares in only one way, i.e., 94984516 + 5837056 = 9746^2 + 2416^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12602693 + ... + 12602700.

It is an arithmetic number, because the mean of its divisors is an integer number (29406293).

Almost surely, 2^100821572 is an apocalyptic number.

It is an amenable number.

100821572 is a deficient number, since it is larger than the sum of its proper divisors (75616186).

100821572 is a wasteful number, since it uses less digits than its factorization.

100821572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25205397 (or 25205395 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 100821572 is about 10040.9945722523. The cubic root of 100821572 is about 465.4265512126.

Adding to 100821572 its reverse (275128001), we get a palindrome (375949573).

The spelling of 100821572 in words is "one hundred million, eight hundred twenty-one thousand, five hundred seventy-two".