202101001 has 4 divisors (see below), whose sum is σ = 202513104. Its totient is φ = 201688900.

The previous prime is 202100999. The next prime is 202101041. The reversal of 202101001 is 100101202.

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 not a de Polignac number, because 202101001 - 2¹ = 202100999 is a prime.

It is a super-3 number, since 3×202101001³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202101041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205315 + ... + 206296.

It is an arithmetic number, because the mean of its divisors is an integer number (50628276).

Almost surely, 2^202101001 is an apocalyptic number.

It is an amenable number.

202101001 is a deficient number, since it is larger than the sum of its proper divisors (412103).

202101001 is an equidigital number, since it uses as much as digits as its factorization.

202101001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412102.

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

The square root of 202101001 is about 14216.2231622889. The cubic root of 202101001 is about 586.8442065900.

Adding to 202101001 its reverse (100101202), we get a palindrome (302202203).

The spelling of 202101001 in words is "two hundred two million, one hundred one thousand, one".