202121220131213 has 4 divisors (see below), whose sum is σ = 202121375096928. Its totient is φ = 202121065165500.

The previous prime is 202121220131153. The next prime is 202121220131249. The reversal of 202121220131213 is 312131022121202.

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 202121220131213 - 2¹² = 202121220127117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121220131273) 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, 75509663 + ... + 78140588.

It is an arithmetic number, because the mean of its divisors is an integer number (50530343774232).

Almost surely, 2^{202121220131213} is an apocalyptic number.

It is an amenable number.

202121220131213 is a deficient number, since it is larger than the sum of its proper divisors (154965715).

202121220131213 is a wasteful number, since it uses less digits than its factorization.

202121220131213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154965714.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 202121220131213 its reverse (312131022121202), we get a palindrome (514252242252415).

The spelling of 202121220131213 in words is "two hundred two trillion, one hundred twenty-one billion, two hundred twenty million, one hundred thirty-one thousand, two hundred thirteen".