221401360 has 20 divisors (see below), whose sum is σ = 514758348. Its totient is φ = 88560512.

The previous prime is 221401343. The next prime is 221401361. The reversal of 221401360 is 63104122.

It can be written as a sum of positive squares in 2 ways, for example, as 131606784 + 89794576 = 11472^2 + 9476^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (221401361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1383679 + ... + 1383838.

Almost surely, 2^221401360 is an apocalyptic number.

221401360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221401360 is an abundant number, since it is smaller than the sum of its proper divisors (293356988).

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

221401360 is a wasteful number, since it uses less digits than its factorization.

221401360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767530 (or 2767524 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 221401360 is about 14879.5618215054. The cubic root of 221401360 is about 604.9601412622.

Adding to 221401360 its reverse (63104122), we get a palindrome (284505482).

The spelling of 221401360 in words is "two hundred twenty-one million, four hundred one thousand, three hundred sixty".