220040320521 has 16 divisors (see below), whose sum is σ = 336046320000. Its totient is φ = 125457282048.

The previous prime is 220040320501. The next prime is 220040320529. The reversal of 220040320521 is 125023040022.

It is not a de Polignac number, because 220040320521 - 2⁷ = 220040320393 is a prime.

It is a super-2 number, since 2×220040320521² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (220040320529) 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, 11658846 + ... + 11677703.

It is an arithmetic number, because the mean of its divisors is an integer number (21002895000).

Almost surely, 2^220040320521 is an apocalyptic number.

220040320521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

220040320521 is a deficient number, since it is larger than the sum of its proper divisors (116005999479).

220040320521 is a wasteful number, since it uses less digits than its factorization.

220040320521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23337008.

The product of its (nonzero) digits is 960, while the sum is 21.

Adding to 220040320521 its reverse (125023040022), we get a palindrome (345063360543).

The spelling of 220040320521 in words is "two hundred twenty billion, forty million, three hundred twenty thousand, five hundred twenty-one".