221340280 has 32 divisors (see below), whose sum is σ = 569161440. Its totient is φ = 75888000.

The previous prime is 221340277. The next prime is 221340281. The reversal of 221340280 is 82043122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221340281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394971 + ... + 395530.

It is an arithmetic number, because the mean of its divisors is an integer number (17786295).

Almost surely, 2^221340280 is an apocalyptic number.

221340280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221340280 is an abundant number, since it is smaller than the sum of its proper divisors (347821160).

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

221340280 is a wasteful number, since it uses less digits than its factorization.

221340280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790519 (or 790515 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 221340280 is about 14877.5092001316. The cubic root of 221340280 is about 604.9045041997.

The spelling of 221340280 in words is "two hundred twenty-one million, three hundred forty thousand, two hundred eighty".