220343310213521 has 64 divisors (see below), whose sum is σ = 254006153510400. Its totient is φ = 189179681433600.

The previous prime is 220343310213497. The next prime is 220343310213541. The reversal of 220343310213521 is 125312013343022.

220343310213521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 220343310213521 - 2³⁸ = 220068432306577 is a prime.

It is a super-2 number, since 2×220343310213521² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (220343310213541) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 84068411591 + ... + 84068414211.

It is an arithmetic number, because the mean of its divisors is an integer number (3968846148600).

Almost surely, 2^{220343310213521} is an apocalyptic number.

It is an amenable number.

220343310213521 is a deficient number, since it is larger than the sum of its proper divisors (33662843296879).

220343310213521 is a wasteful number, since it uses less digits than its factorization.

220343310213521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6650.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 220343310213521 its reverse (125312013343022), we get a palindrome (345655323556543).

The spelling of 220343310213521 in words is "two hundred twenty trillion, three hundred forty-three billion, three hundred ten million, two hundred thirteen thousand, five hundred twenty-one".