202121201 has 4 divisors (see below), whose sum is σ = 203459904. Its totient is φ = 200782500.

The previous prime is 202121191. The next prime is 202121203. The reversal of 202121201 is 102121202.

It is a happy number.

202121201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 102121202 = 2 ⋅51060601.

It is a cyclic number.

It is not a de Polignac number, because 202121201 - 2⁶ = 202121137 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 (202121203) 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, 669125 + ... + 669426.

It is an arithmetic number, because the mean of its divisors is an integer number (50864976).

Almost surely, 2^202121201 is an apocalyptic number.

It is an amenable number.

202121201 is a deficient number, since it is larger than the sum of its proper divisors (1338703).

202121201 is a wasteful number, since it uses less digits than its factorization.

202121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338702.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 202121201 is about 14216.9336004639. The cubic root of 202121201 is about 586.8637576362.

Adding to 202121201 its reverse (102121202), we get a palindrome (304242403).

Subtracting from 202121201 its reverse (102121202), we obtain a palindrome (99999999).

The spelling of 202121201 in words is "two hundred two million, one hundred twenty-one thousand, two hundred one".