221401260 has 72 divisors (see below), whose sum is σ = 674593920. Its totient is φ = 58775808.

The previous prime is 221401199. The next prime is 221401261. The reversal of 221401260 is 62104122.

221401260 is a `hidden beast` number, since 2 + 2 + 1 + 401 + 260 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221401261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39301 + ... + 44579.

It is an arithmetic number, because the mean of its divisors is an integer number (9369360).

Almost surely, 2^221401260 is an apocalyptic number.

221401260 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 221401260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337296960).

221401260 is an abundant number, since it is smaller than the sum of its proper divisors (453192660).

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

221401260 is a wasteful number, since it uses less digits than its factorization.

221401260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5527 (or 5522 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 221401260 is about 14879.5584611910. The cubic root of 221401260 is about 604.9600501818.

Adding to 221401260 its reverse (62104122), we get a palindrome (283505382).

The spelling of 221401260 in words is "two hundred twenty-one million, four hundred one thousand, two hundred sixty".