221525229 has 8 divisors (see below), whose sum is σ = 305552160. Its totient is φ = 142590896.

The previous prime is 221525191. The next prime is 221525233. The reversal of 221525229 is 922525122.

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

It is a cyclic number.

It is not a de Polignac number, because 221525229 - 2⁸ = 221524973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221525196 and 221525205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221535229) 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, 1273047 + ... + 1273220.

It is an arithmetic number, because the mean of its divisors is an integer number (38194020).

Almost surely, 2^221525229 is an apocalyptic number.

221525229 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

221525229 is a deficient number, since it is larger than the sum of its proper divisors (84026931).

221525229 is a wasteful number, since it uses less digits than its factorization.

221525229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2546299.

The product of its digits is 7200, while the sum is 30.

The square root of 221525229 is about 14883.7236268348. The cubic root of 221525229 is about 605.0729406855.

It can be divided in two parts, 22 and 1525229, that added together give a palindrome (1525251).

The spelling of 221525229 in words is "two hundred twenty-one million, five hundred twenty-five thousand, two hundred twenty-nine".