220401441521 has 2 divisors, whose sum is σ = 220401441522. Its totient is φ = 220401441520.

The previous prime is 220401441497. The next prime is 220401441553. The reversal of 220401441521 is 125144104022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208767661921 + 11633779600 = 456911^2 + 107860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220401441521 is a prime.

It is not a weakly prime, because it can be changed into another prime (220401441571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110200720760 + 110200720761.

It is an arithmetic number, because the mean of its divisors is an integer number (110200720761).

Almost surely, 2^220401441521 is an apocalyptic number.

It is an amenable number.

220401441521 is a deficient number, since it is larger than the sum of its proper divisors (1).

220401441521 is an equidigital number, since it uses as much as digits as its factorization.

220401441521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 220401441521 its reverse (125144104022), we get a palindrome (345545545543).

The spelling of 220401441521 in words is "two hundred twenty billion, four hundred one million, four hundred forty-one thousand, five hundred twenty-one".