220440105521 has 8 divisors (see below), whose sum is σ = 228342754920. Its totient is φ = 212557540608.

The previous prime is 220440105437. The next prime is 220440105533. The reversal of 220440105521 is 125501044022.

It can be written as a sum of positive squares in 4 ways, for example, as 5403867121 + 215036238400 = 73511^2 + 463720^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220440105521 is a prime.

It is a super-2 number, since 2×220440105521² (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 (220440105551) 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, 4998776 + ... + 5042681.

It is an arithmetic number, because the mean of its divisors is an integer number (28542844365).

Almost surely, 2^220440105521 is an apocalyptic number.

It is an amenable number.

220440105521 is a deficient number, since it is larger than the sum of its proper divisors (7902649399).

220440105521 is a wasteful number, since it uses less digits than its factorization.

220440105521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10042243.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 220440105521 its reverse (125501044022), we get a palindrome (345941149543).

The spelling of 220440105521 in words is "two hundred twenty billion, four hundred forty million, one hundred five thousand, five hundred twenty-one".