221067725 has 24 divisors (see below), whose sum is σ = 287529960. Its totient is φ = 168376320.

The previous prime is 221067719. The next prime is 221067731. The reversal of 221067725 is 527760122.

It is an interprime number because it is at equal distance from previous prime (221067719) and next prime (221067731).

It can be written as a sum of positive squares in 12 ways, for example, as 12033961 + 209033764 = 3469^2 + 14458^2 .

It is not a de Polignac number, because 221067725 - 2⁴ = 221067709 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221067691 and 221067700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50837 + ... + 55013.

It is an arithmetic number, because the mean of its divisors is an integer number (11980415).

Almost surely, 2^221067725 is an apocalyptic number.

221067725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221067725 is a deficient number, since it is larger than the sum of its proper divisors (66462235).

221067725 is a wasteful number, since it uses less digits than its factorization.

221067725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4289 (or 4284 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 221067725 is about 14868.3464110842. The cubic root of 221067725 is about 604.6561121972.

The spelling of 221067725 in words is "two hundred twenty-one million, sixty-seven thousand, seven hundred twenty-five".