221520004011 has 16 divisors (see below), whose sum is σ = 338764165120. Its totient is φ = 142916131080.

The previous prime is 221520003941. The next prime is 221520004049. The reversal of 221520004011 is 110400025122.

It is not a de Polignac number, because 221520004011 - 2¹⁵ = 221519971243 is a prime.

It is a super-2 number, since 2×221520004011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221520104011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132328915 + ... + 132330588.

It is an arithmetic number, because the mean of its divisors is an integer number (21172760320).

Almost surely, 2^221520004011 is an apocalyptic number.

221520004011 is a deficient number, since it is larger than the sum of its proper divisors (117244161109).

221520004011 is a wasteful number, since it uses less digits than its factorization.

221520004011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264659543 (or 264659537 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 221520004011 its reverse (110400025122), we get a palindrome (331920029133).

The spelling of 221520004011 in words is "two hundred twenty-one billion, five hundred twenty million, four thousand, eleven".