221201340 has 48 divisors (see below), whose sum is σ = 620114208. Its totient is φ = 58915584.

The previous prime is 221201339. The next prime is 221201359. The reversal of 221201340 is 43102122.

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

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, 63894 + ... + 67266.

It is an arithmetic number, because the mean of its divisors is an integer number (12919046).

Almost surely, 2^221201340 is an apocalyptic number.

221201340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201340 is an abundant number, since it is smaller than the sum of its proper divisors (398912868).

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

221201340 is a wasteful number, since it uses less digits than its factorization.

221201340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4478 (or 4476 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221201340 is about 14872.8390026921. The cubic root of 221201340 is about 604.7779072338. Note that the first 3 decimals are identical.

Adding to 221201340 its reverse (43102122), we get a palindrome (264303462).

The spelling of 221201340 in words is "two hundred twenty-one million, two hundred one thousand, three hundred forty".