202021032121 has 4 divisors (see below), whose sum is σ = 202023578752. Its totient is φ = 202018485492.

The previous prime is 202021032089. The next prime is 202021032131. The reversal of 202021032121 is 121230120202.

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 202021032121 - 2⁵ = 202021032089 is a prime.

It is a super-2 number, since 2×202021032121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202021032095 and 202021032104.

It is not an unprimeable number, because it can be changed into a prime (202021032131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1150365 + ... + 1314298.

It is an arithmetic number, because the mean of its divisors is an integer number (50505894688).

Almost surely, 2^202021032121 is an apocalyptic number.

It is an amenable number.

202021032121 is a deficient number, since it is larger than the sum of its proper divisors (2546631).

202021032121 is an equidigital number, since it uses as much as digits as its factorization.

202021032121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2546630.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 202021032121 its reverse (121230120202), we get a palindrome (323251152323).

The spelling of 202021032121 in words is "two hundred two billion, twenty-one million, thirty-two thousand, one hundred twenty-one".