201202121221 has 4 divisors (see below), whose sum is σ = 201265735552. Its totient is φ = 201138506892.

The previous prime is 201202121143. The next prime is 201202121231. The reversal of 201202121221 is 122121202102.

It is a happy number.

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 201202121221 - 2²⁹ = 200665250309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201202121195 and 201202121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201202121231) 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, 31802421 + ... + 31808746.

It is an arithmetic number, because the mean of its divisors is an integer number (50316433888).

Almost surely, 2^201202121221 is an apocalyptic number.

It is an amenable number.

201202121221 is a deficient number, since it is larger than the sum of its proper divisors (63614331).

201202121221 is an equidigital number, since it uses as much as digits as its factorization.

201202121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63614330.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 201202121221 its reverse (122121202102), we get a palindrome (323323323323).

The spelling of 201202121221 in words is "two hundred one billion, two hundred two million, one hundred twenty-one thousand, two hundred twenty-one".