202121056 has 48 divisors (see below), whose sum is σ = 424134144. Its totient is φ = 94593664.

The previous prime is 202121053. The next prime is 202121057. The reversal of 202121056 is 650121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31671 + ... + 37513.

It is an arithmetic number, because the mean of its divisors is an integer number (8836128).

Almost surely, 2^202121056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202121056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212067072).

202121056 is an abundant number, since it is smaller than the sum of its proper divisors (222013088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

202121056 is a wasteful number, since it uses less digits than its factorization.

202121056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5923 (or 5915 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 202121056 is about 14216.9285009105. The cubic root of 202121056 is about 586.8636172992.

Adding to 202121056 its reverse (650121202), we get a palindrome (852242258).

The spelling of 202121056 in words is "two hundred two million, one hundred twenty-one thousand, fifty-six".