100021201 has 16 divisors (see below), whose sum is σ = 117424000. Its totient is φ = 85158864.

The previous prime is 100021199. The next prime is 100021223. The reversal of 100021201 is 102120001.

It is not a de Polignac number, because 100021201 - 2¹ = 100021199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100021231) 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, 55015 + ... + 56803.

It is an arithmetic number, because the mean of its divisors is an integer number (7339000).

Almost surely, 2^100021201 is an apocalyptic number.

It is an amenable number.

100021201 is a deficient number, since it is larger than the sum of its proper divisors (17402799).

100021201 is an equidigital number, since it uses as much as digits as its factorization.

100021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973 (or 1959 counting only the distinct ones).

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

The square root of 100021201 is about 10001.0599938207. The cubic root of 100021201 is about 464.1916831517.

Adding to 100021201 its reverse (102120001), we get a palindrome (202141202).

It can be divided in two parts, 1000 and 21201, that added together give a square (22201 = 149²).

The spelling of 100021201 in words is "one hundred million, twenty-one thousand, two hundred one".