221540223040 has 56 divisors (see below), whose sum is σ = 531393437592. Its totient is φ = 87969239040.

The previous prime is 221540223029. The next prime is 221540223043. The reversal of 221540223040 is 40322045122.

It can be written as a sum of positive squares in 4 ways, for example, as 4764312576 + 216775910464 = 69024^2 + 465592^2 .

It is a super-2 number, since 2×221540223040² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221540222996 and 221540223014.

It is not an unprimeable number, because it can be changed into a prime (221540223043) 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, 2482851 + ... + 2570530.

Almost surely, 2^221540223040 is an apocalyptic number.

221540223040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221540223040 is an abundant number, since it is smaller than the sum of its proper divisors (309853214552).

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

221540223040 is a wasteful number, since it uses less digits than its factorization.

221540223040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5053535 (or 5053525 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 221540223040 its reverse (40322045122), we get a palindrome (261862268162).

The spelling of 221540223040 in words is "two hundred twenty-one billion, five hundred forty million, two hundred twenty-three thousand, forty".