221064540 has 48 divisors (see below), whose sum is σ = 620067840. Its totient is φ = 58847040.

The previous prime is 221064539. The next prime is 221064541. The reversal of 221064540 is 45460122.

It is an interprime number because it is at equal distance from previous prime (221064539) and next prime (221064541).

It is a self number, because there is not a number n which added to its sum of digits gives 221064540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221064541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34941 + ... + 40779.

It is an arithmetic number, because the mean of its divisors is an integer number (12918080).

Almost surely, 2^221064540 is an apocalyptic number.

221064540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221064540 is an abundant number, since it is smaller than the sum of its proper divisors (399003300).

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

221064540 is a wasteful number, since it uses less digits than its factorization.

221064540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6482 (or 6480 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 221064540 is about 14868.2393039660. The cubic root of 221064540 is about 604.6532083526.

The spelling of 221064540 in words is "two hundred twenty-one million, sixty-four thousand, five hundred forty".