221252523 has 8 divisors (see below), whose sum is σ = 302198736. Its totient is φ = 143904000.

The previous prime is 221252509. The next prime is 221252533. The reversal of 221252523 is 325252122.

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

It is not a de Polignac number, because 221252523 - 2⁹ = 221252011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221252493 and 221252502.

It is not an unprimeable number, because it can be changed into a prime (221252533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 899278 + ... + 899523.

It is an arithmetic number, because the mean of its divisors is an integer number (37774842).

Almost surely, 2^221252523 is an apocalyptic number.

221252523 is a deficient number, since it is larger than the sum of its proper divisors (80946213).

221252523 is a wasteful number, since it uses less digits than its factorization.

221252523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798845.

The product of its digits is 2400, while the sum is 24.

The square root of 221252523 is about 14874.5595901190. The cubic root of 221252523 is about 604.8245494474.

The spelling of 221252523 in words is "two hundred twenty-one million, two hundred fifty-two thousand, five hundred twenty-three".