221544513460 has 24 divisors (see below), whose sum is σ = 471796206336. Its totient is φ = 87369666720.

The previous prime is 221544513457. The next prime is 221544513467. The reversal of 221544513460 is 64315445122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221544513467) 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, 78007212 + ... + 78010051.

It is an arithmetic number, because the mean of its divisors is an integer number (19658175264).

Almost surely, 2^221544513460 is an apocalyptic number.

221544513460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221544513460 is an abundant number, since it is smaller than the sum of its proper divisors (250251692876).

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

221544513460 is a wasteful number, since it uses less digits than its factorization.

221544513460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156017343 (or 156017341 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 221544513460 its reverse (64315445122), we get a palindrome (285859958582).

The spelling of 221544513460 in words is "two hundred twenty-one billion, five hundred forty-four million, five hundred thirteen thousand, four hundred sixty".