221142523 has 8 divisors (see below), whose sum is σ = 254580192. Its totient is φ = 188166336.

The previous prime is 221142521. The next prime is 221142527. The reversal of 221142523 is 325241122.

It is a happy number.

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 221142523 - 2¹ = 221142521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221142494 and 221142503.

It is not an unprimeable number, because it can be changed into a prime (221142521) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 114340 + ... + 116257.

It is an arithmetic number, because the mean of its divisors is an integer number (31822524).

Almost surely, 2^221142523 is an apocalyptic number.

221142523 is a deficient number, since it is larger than the sum of its proper divisors (33437669).

221142523 is a wasteful number, since it uses less digits than its factorization.

221142523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230741.

The product of its digits is 960, while the sum is 22.

The square root of 221142523 is about 14870.8615419551. The cubic root of 221142523 is about 604.7242993979.

Adding to 221142523 its reverse (325241122), we get a palindrome (546383645).

The spelling of 221142523 in words is "two hundred twenty-one million, one hundred forty-two thousand, five hundred twenty-three".