221248780 has 24 divisors (see below), whose sum is σ = 471169440. Its totient is φ = 87252480.

The previous prime is 221248771. The next prime is 221248793. The reversal of 221248780 is 87842122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76485 + ... + 79324.

It is an arithmetic number, because the mean of its divisors is an integer number (19632060).

Almost surely, 2^221248780 is an apocalyptic number.

221248780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221248780 is an abundant number, since it is smaller than the sum of its proper divisors (249920660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221248780 is a wasteful number, since it uses less digits than its factorization.

221248780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155889 (or 155887 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 221248780 is about 14874.4337707356. The cubic root of 221248780 is about 604.8211387578.

It can be divided in two parts, 221 and 248780, that added together give a square (249001 = 499²).

The spelling of 221248780 in words is "two hundred twenty-one million, two hundred forty-eight thousand, seven hundred eighty".