221248726 has 4 divisors (see below), whose sum is σ = 331873092. Its totient is φ = 110624362.

The previous prime is 221248723. The next prime is 221248733. The reversal of 221248726 is 627842122.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×221248726³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221248691 and 221248700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221248721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55312180 + ... + 55312183.

It is an arithmetic number, because the mean of its divisors is an integer number (82968273).

Almost surely, 2^221248726 is an apocalyptic number.

221248726 is a deficient number, since it is larger than the sum of its proper divisors (110624366).

221248726 is a wasteful number, since it uses less digits than its factorization.

221248726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110624365.

The product of its digits is 21504, while the sum is 34.

The square root of 221248726 is about 14874.4319555404. The cubic root of 221248726 is about 604.8210895517.

The spelling of 221248726 in words is "two hundred twenty-one million, two hundred forty-eight thousand, seven hundred twenty-six".