221257075 has 24 divisors (see below), whose sum is σ = 305008256. Its totient is φ = 158112000.

The previous prime is 221257063. The next prime is 221257093. The reversal of 221257075 is 570752122.

221257075 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221257075 - 2⁷ = 221256947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

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, 906 + ... + 21055.

Almost surely, 2^221257075 is an apocalyptic number.

221257075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221257075 is a deficient number, since it is larger than the sum of its proper divisors (83751181).

221257075 is a wasteful number, since it uses less digits than its factorization.

221257075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22015 (or 22010 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 221257075 is about 14874.7126022656. The cubic root of 221257075 is about 604.8286972607.

The spelling of 221257075 in words is "two hundred twenty-one million, two hundred fifty-seven thousand, seventy-five".