202121216 has 56 divisors (see below), whose sum is σ = 441161424. Its totient is φ = 91832320.

The previous prime is 202121203. The next prime is 202121219. The reversal of 202121216 is 612121202.

It is a junction number, because it is equal to n+sod(n) for n = 202121194 and 202121203.

It is not an unprimeable number, because it can be changed into a prime (202121219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88991 + ... + 91233.

Almost surely, 2^202121216 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 202121216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220580712).

202121216 is an abundant number, since it is smaller than the sum of its proper divisors (239040208).

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

202121216 is an equidigital number, since it uses as much as digits as its factorization.

202121216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280 (or 2256 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 202121216 is about 14216.9341280038. The cubic root of 202121216 is about 586.8637721539.

Adding to 202121216 its reverse (612121202), we get a palindrome (814242418).

The spelling of 202121216 in words is "two hundred two million, one hundred twenty-one thousand, two hundred sixteen".