221010540 has 96 divisors (see below), whose sum is σ = 670602240. Its totient is φ = 54168576.

The previous prime is 221010539. The next prime is 221010547. The reversal of 221010540 is 45010122.

221010540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (221010547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41341 + ... + 46379.

It is an arithmetic number, because the mean of its divisors is an integer number (6985440).

Almost surely, 2^221010540 is an apocalyptic number.

221010540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221010540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335301120).

221010540 is an abundant number, since it is smaller than the sum of its proper divisors (449591700).

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

221010540 is a wasteful number, since it uses less digits than its factorization.

221010540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5111 (or 5109 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 221010540 is about 14866.4232416543. The cubic root of 221010540 is about 604.6039709485.

Adding to 221010540 its reverse (45010122), we get a palindrome (266020662).

The spelling of 221010540 in words is "two hundred twenty-one million, ten thousand, five hundred forty".