221522135 has 8 divisors (see below), whose sum is σ = 266774256. Its totient is φ = 176585920.

The previous prime is 221522113. The next prime is 221522137. The reversal of 221522135 is 531225122.

221522135 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221522135 - 2¹⁸ = 221259991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221522135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221522137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77429 + ... + 80238.

It is an arithmetic number, because the mean of its divisors is an integer number (33346782).

Almost surely, 2^221522135 is an apocalyptic number.

221522135 is a deficient number, since it is larger than the sum of its proper divisors (45252121).

221522135 is a wasteful number, since it uses less digits than its factorization.

221522135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157953.

The product of its digits is 1200, while the sum is 23.

The square root of 221522135 is about 14883.6196874282. The cubic root of 221522135 is about 605.0701236935.

Adding to 221522135 its reverse (531225122), we get a palindrome (752747257).

The spelling of 221522135 in words is "two hundred twenty-one million, five hundred twenty-two thousand, one hundred thirty-five".