221263725 has 12 divisors (see below), whose sum is σ = 365822816. Its totient is φ = 118007280.

The previous prime is 221263723. The next prime is 221263727. The reversal of 221263725 is 527362122.

It is an interprime number because it is at equal distance from previous prime (221263723) and next prime (221263727).

It is not a de Polignac number, because 221263725 - 2¹ = 221263723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221263692 and 221263701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221263723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1475017 + ... + 1475166.

Almost surely, 2^221263725 is an apocalyptic number.

221263725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221263725 is a deficient number, since it is larger than the sum of its proper divisors (144559091).

221263725 is a wasteful number, since it uses less digits than its factorization.

221263725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950196 (or 2950191 counting only the distinct ones).

The product of its digits is 10080, while the sum is 30.

The square root of 221263725 is about 14874.9361343167. The cubic root of 221263725 is about 604.8347566836.

The spelling of 221263725 in words is "two hundred twenty-one million, two hundred sixty-three thousand, seven hundred twenty-five".