202120001 has 4 divisors (see below), whose sum is σ = 202155312. Its totient is φ = 202084692.

The previous prime is 202119989. The next prime is 202120091. The reversal of 202120001 is 100021202.

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 202120001 - 2²⁶ = 135011137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (202120091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6875 + ... + 21248.

It is an arithmetic number, because the mean of its divisors is an integer number (50538828).

Almost surely, 2^202120001 is an apocalyptic number.

It is an amenable number.

202120001 is a deficient number, since it is larger than the sum of its proper divisors (35311).

202120001 is an equidigital number, since it uses as much as digits as its factorization.

202120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35310.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 202120001 is about 14216.8913972078. The cubic root of 202120001 is about 586.8625962243.

Adding to 202120001 its reverse (100021202), we get a palindrome (302141203).

It can be divided in two parts, 2021 and 20001, that added together give a palindrome (22022).

The spelling of 202120001 in words is "two hundred two million, one hundred twenty thousand, one".