100021285 has 64 divisors (see below), whose sum is σ = 159570432. Its totient is φ = 58392576.

The previous prime is 100021279. The next prime is 100021289. The reversal of 100021285 is 582120001.

It is a 8-Lehmer number, since φ(100021285) divides (100021285-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 100021285 - 2³ = 100021277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021289) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 518149 + ... + 518341.

It is an arithmetic number, because the mean of its divisors is an integer number (2493288).

Almost surely, 2^100021285 is an apocalyptic number.

It is an amenable number.

100021285 is a deficient number, since it is larger than the sum of its proper divisors (59549147).

100021285 is a wasteful number, since it uses less digits than its factorization.

100021285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 100021285 is about 10001.0641933746. The cubic root of 100021285 is about 464.1918130978.

Adding to 100021285 its reverse (582120001), we get a palindrome (682141286).

The spelling of 100021285 in words is "one hundred million, twenty-one thousand, two hundred eighty-five".