221423525 has 12 divisors (see below), whose sum is σ = 276544800. Its totient is φ = 175861680.

The previous prime is 221423479. The next prime is 221423539. The reversal of 221423525 is 525324122.

It is not a de Polignac number, because 221423525 - 2⁸ = 221423269 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221423494 and 221423503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28385 + ... + 35334.

It is an arithmetic number, because the mean of its divisors is an integer number (23045400).

Almost surely, 2^221423525 is an apocalyptic number.

221423525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221423525 is a deficient number, since it is larger than the sum of its proper divisors (55121275).

221423525 is a wasteful number, since it uses less digits than its factorization.

221423525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63868 (or 63863 counting only the distinct ones).

The product of its digits is 4800, while the sum is 26.

The square root of 221423525 is about 14880.3066164646. The cubic root of 221423525 is about 604.9803285729.

Adding to 221423525 its reverse (525324122), we get a palindrome (746747647).

The spelling of 221423525 in words is "two hundred twenty-one million, four hundred twenty-three thousand, five hundred twenty-five".