221541340 has 24 divisors (see below), whose sum is σ = 468905472. Its totient is φ = 87917760.

The previous prime is 221541337. The next prime is 221541343. The reversal of 221541340 is 43145122.

It is an interprime number because it is at equal distance from previous prime (221541337) and next prime (221541343).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221541343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41071 + ... + 46150.

It is an arithmetic number, because the mean of its divisors is an integer number (19537728).

Almost surely, 2^221541340 is an apocalyptic number.

221541340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221541340 is an abundant number, since it is smaller than the sum of its proper divisors (247364132).

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

221541340 is a wasteful number, since it uses less digits than its factorization.

221541340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87357 (or 87355 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 221541340 is about 14884.2648458028. The cubic root of 221541340 is about 605.0876088324.

Adding to 221541340 its reverse (43145122), we get a palindrome (264686462).

The spelling of 221541340 in words is "two hundred twenty-one million, five hundred forty-one thousand, three hundred forty".