221380540 has 12 divisors (see below), whose sum is σ = 464899176. Its totient is φ = 88552208.

The previous prime is 221380459. The next prime is 221380541. The reversal of 221380540 is 45083122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221380541) 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 in 3 ways as a sum of consecutive naturals, for example, 5534494 + ... + 5534533.

It is an arithmetic number, because the mean of its divisors is an integer number (38741598).

Almost surely, 2^221380540 is an apocalyptic number.

221380540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221380540 is an abundant number, since it is smaller than the sum of its proper divisors (243518636).

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

221380540 is a wasteful number, since it uses less digits than its factorization.

221380540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11069036 (or 11069034 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 221380540 is about 14878.8621876809. The cubic root of 221380540 is about 604.9411777157.

The spelling of 221380540 in words is "two hundred twenty-one million, three hundred eighty thousand, five hundred forty".