221226371540 has 24 divisors (see below), whose sum is σ = 464584253280. Its totient is φ = 88488858528.

The previous prime is 221226371537. The next prime is 221226371567. The reversal of 221226371540 is 45173622122.

It is a super-2 number, since 2×221226371540² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221226371540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1858331 + ... + 1973789.

It is an arithmetic number, because the mean of its divisors is an integer number (19357677220).

Almost surely, 2^221226371540 is an apocalyptic number.

221226371540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221226371540 is an abundant number, since it is smaller than the sum of its proper divisors (243357881740).

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

221226371540 is a wasteful number, since it uses less digits than its factorization.

221226371540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211271 (or 211269 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

Adding to 221226371540 its reverse (45173622122), we get a palindrome (266399993662).

The spelling of 221226371540 in words is "two hundred twenty-one billion, two hundred twenty-six million, three hundred seventy-one thousand, five hundred forty".