221263525 has 12 divisors (see below), whose sum is σ = 313562272. Its totient is φ = 151723440.

The previous prime is 221263507. The next prime is 221263541. The reversal of 221263525 is 525362122.

It is a de Polignac number, because none of the positive numbers 2^k-221263525 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221263493 and 221263502.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 632007 + ... + 632356.

Almost surely, 2^221263525 is an apocalyptic number.

221263525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221263525 is a deficient number, since it is larger than the sum of its proper divisors (92298747).

221263525 is a wasteful number, since it uses less digits than its factorization.

221263525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264380 (or 1264375 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 221263525 is about 14874.9294115972. The cubic root of 221263525 is about 604.8345744470.

It can be divided in two parts, 22126 and 3525, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 221263525 in words is "two hundred twenty-one million, two hundred sixty-three thousand, five hundred twenty-five".