221025957 has 8 divisors (see below), whose sum is σ = 301889280. Its totient is φ = 143756640.

The previous prime is 221025947. The next prime is 221025979. The reversal of 221025957 is 759520122.

It is a happy number.

221025957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221025957 - 2⁷ = 221025829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221025947) 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, 898357 + ... + 898602.

It is an arithmetic number, because the mean of its divisors is an integer number (37736160).

Almost surely, 2^221025957 is an apocalyptic number.

It is an amenable number.

221025957 is a deficient number, since it is larger than the sum of its proper divisors (80863323).

221025957 is a wasteful number, since it uses less digits than its factorization.

221025957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797003.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 221025957 is about 14866.9417500709. The cubic root of 221025957 is about 604.6180290453.

The spelling of 221025957 in words is "two hundred twenty-one million, twenty-five thousand, nine hundred fifty-seven".