100821256 has 16 divisors (see below), whose sum is σ = 189660240. Its totient is φ = 50245200.

The previous prime is 100821233. The next prime is 100821289. The reversal of 100821256 is 652128001.

It is a super-2 number, since 2×100821256² = 20329851322835072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 100821256.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18070 + ... + 22981.

It is an arithmetic number, because the mean of its divisors is an integer number (11853765).

Almost surely, 2^100821256 is an apocalyptic number.

It is an amenable number.

100821256 is a deficient number, since it is larger than the sum of its proper divisors (88838984).

100821256 is a wasteful number, since it uses less digits than its factorization.

100821256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41364 (or 41360 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 100821256 is about 10040.9788367469. The cubic root of 100821256 is about 465.4260649577.

Adding to 100821256 its reverse (652128001), we get a palindrome (752949257).

The spelling of 100821256 in words is "one hundred million, eight hundred twenty-one thousand, two hundred fifty-six".