221425787 has 8 divisors (see below), whose sum is σ = 241678080. Its totient is φ = 201193960.

The previous prime is 221425747. The next prime is 221425793. The reversal of 221425787 is 787524122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221425787 - 2²⁴ = 204648571 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221425787.

It is not an unprimeable number, because it can be changed into a prime (221425747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25514 + ... + 33072.

It is an arithmetic number, because the mean of its divisors is an integer number (30209760).

Almost surely, 2^221425787 is an apocalyptic number.

221425787 is a deficient number, since it is larger than the sum of its proper divisors (20252293).

221425787 is a wasteful number, since it uses less digits than its factorization.

221425787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10233.

The product of its digits is 62720, while the sum is 38.

The square root of 221425787 is about 14880.3826227688. The cubic root of 221425787 is about 604.9823886684.

The spelling of 221425787 in words is "two hundred twenty-one million, four hundred twenty-five thousand, seven hundred eighty-seven".