202121144 has 16 divisors (see below), whose sum is σ = 388221120. Its totient is φ = 98595520.

The previous prime is 202121137. The next prime is 202121189. The reversal of 202121144 is 441121202.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 307784 + ... + 308439.

It is an arithmetic number, because the mean of its divisors is an integer number (24263820).

Almost surely, 2^202121144 is an apocalyptic number.

It is an amenable number.

202121144 is a deficient number, since it is larger than the sum of its proper divisors (186099976).

202121144 is a wasteful number, since it uses less digits than its factorization.

202121144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616270 (or 616266 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 202121144 is about 14216.9315958121. The cubic root of 202121144 is about 586.8637024693.

Adding to 202121144 its reverse (441121202), we get a palindrome (643242346).

The spelling of 202121144 in words is "two hundred two million, one hundred twenty-one thousand, one hundred forty-four".