221520542202 has 32 divisors (see below), whose sum is σ = 508147484160. Its totient is φ = 71458238880.

The previous prime is 221520542179. The next prime is 221520542203. The reversal of 221520542202 is 202245025122.

It is a happy number.

221520542202 is a `hidden beast` number, since 2 + 215 + 20 + 5 + 422 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (221520542203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66163363 + ... + 66166710.

It is an arithmetic number, because the mean of its divisors is an integer number (15879608880).

Almost surely, 2^221520542202 is an apocalyptic number.

221520542202 is an abundant number, since it is smaller than the sum of its proper divisors (286626941958).

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

221520542202 is a wasteful number, since it uses less digits than its factorization.

221520542202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132330115 (or 132330109 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 221520542202 its reverse (202245025122), we get a palindrome (423765567324).

The spelling of 221520542202 in words is "two hundred twenty-one billion, five hundred twenty million, five hundred forty-two thousand, two hundred two".