100201021 has 4 divisors (see below), whose sum is σ = 103433344. Its totient is φ = 96968700.

The previous prime is 100200967. The next prime is 100201037. The reversal of 100201021 is 120102001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100201021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100200995 and 100201013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100201091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1616115 + ... + 1616176.

It is an arithmetic number, because the mean of its divisors is an integer number (25858336).

Almost surely, 2^100201021 is an apocalyptic number.

It is an amenable number.

100201021 is a deficient number, since it is larger than the sum of its proper divisors (3232323).

100201021 is an equidigital number, since it uses as much as digits as its factorization.

100201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3232322.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 100201021 is about 10010.0460038903. The cubic root of 100201021 is about 464.4696941322.

Adding to 100201021 its reverse (120102001), we get a palindrome (220303022).

The spelling of 100201021 in words is "one hundred million, two hundred one thousand, twenty-one".