221028753 has 8 divisors (see below), whose sum is σ = 321496416. Its totient is φ = 133956800.

The previous prime is 221028701. The next prime is 221028757. The reversal of 221028753 is 357820122.

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

It is a cyclic number.

It is not a de Polignac number, because 221028753 - 2¹³ = 221020561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221028753.

It is not an unprimeable number, because it can be changed into a prime (221028757) 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, 3348888 + ... + 3348953.

It is an arithmetic number, because the mean of its divisors is an integer number (40187052).

Almost surely, 2^221028753 is an apocalyptic number.

It is an amenable number.

221028753 is a deficient number, since it is larger than the sum of its proper divisors (100467663).

221028753 is a wasteful number, since it uses less digits than its factorization.

221028753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6697855.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 221028753 is about 14867.0357839080. The cubic root of 221028753 is about 604.6205785270.

Adding to 221028753 its reverse (357820122), we get a palindrome (578848875).

The spelling of 221028753 in words is "two hundred twenty-one million, twenty-eight thousand, seven hundred fifty-three".