221052540 has 48 divisors (see below), whose sum is σ = 645861888. Its totient is φ = 56384064.

The previous prime is 221052511. The next prime is 221052569. The reversal of 221052540 is 45250122.

It is a happy number.

221052540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221052511) and next prime (221052569).

It is a super-3 number, since 3×221052540³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78712 + ... + 81471.

It is an arithmetic number, because the mean of its divisors is an integer number (13455456).

Almost surely, 2^221052540 is an apocalyptic number.

221052540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221052540 is an abundant number, since it is smaller than the sum of its proper divisors (424809348).

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

221052540 is a wasteful number, since it uses less digits than its factorization.

221052540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160218 (or 160216 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 221052540 is about 14867.8357537336. The cubic root of 221052540 is about 604.6422674002.

The spelling of 221052540 in words is "two hundred twenty-one million, fifty-two thousand, five hundred forty".