202145121 has 12 divisors (see below), whose sum is σ = 295684480. Its totient is φ = 133057080.

The previous prime is 202145101. The next prime is 202145131. The reversal of 202145121 is 121541202.

It is not a de Polignac number, because 202145121 - 2⁹ = 202144609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202145094 and 202145103.

It is not an unprimeable number, because it can be changed into a prime (202145101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141445 + ... + 142866.

Almost surely, 2^202145121 is an apocalyptic number.

It is an amenable number.

202145121 is a deficient number, since it is larger than the sum of its proper divisors (93539359).

202145121 is a wasteful number, since it uses less digits than its factorization.

202145121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284396 (or 284393 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 202145121 is about 14217.7748259001. The cubic root of 202145121 is about 586.8869074877.

Adding to 202145121 its reverse (121541202), we get a palindrome (323686323).

The spelling of 202145121 in words is "two hundred two million, one hundred forty-five thousand, one hundred twenty-one".