221221121202 has 24 divisors (see below), whose sum is σ = 489510567936. Its totient is φ = 72171429336.

The previous prime is 221221121197. The next prime is 221221121267. The reversal of 221221121202 is 202121122122.

It is a happy number.

221221121202 is a `hidden beast` number, since 221 + 221 + 1 + 21 + 202 = 666.

221221121202 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 130744498 + ... + 130746189.

It is an arithmetic number, because the mean of its divisors is an integer number (20396273664).

Almost surely, 2^221221121202 is an apocalyptic number.

221221121202 is an abundant number, since it is smaller than the sum of its proper divisors (268289446734).

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

221221121202 is a wasteful number, since it uses less digits than its factorization.

221221121202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261490742 (or 261490739 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221221121202 its reverse (202121122122), we get a palindrome (423342243324).

The spelling of 221221121202 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred two".