202121312 has 24 divisors (see below), whose sum is σ = 403869816. Its totient is φ = 99551232.

The previous prime is 202121303. The next prime is 202121317. The reversal of 202121312 is 213121202.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44993 + ... + 49280.

It is an arithmetic number, because the mean of its divisors is an integer number (16827909).

Almost surely, 2^202121312 is an apocalyptic number.

It is an amenable number.

202121312 is a deficient number, since it is larger than the sum of its proper divisors (201748504).

202121312 is an equidigital number, since it uses as much as digits as its factorization.

202121312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94350 (or 94342 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 202121312 is about 14216.9375042588. The cubic root of 202121312 is about 586.8638650666.

Adding to 202121312 its reverse (213121202), we get a palindrome (415242514).

The spelling of 202121312 in words is "two hundred two million, one hundred twenty-one thousand, three hundred twelve".