20513432400321 has 64 divisors (see below), whose sum is σ = 32990797598720. Its totient is φ = 11075665040640.

The previous prime is 20513432400277. The next prime is 20513432400323. The reversal of 20513432400321 is 12300423431502.

It is not a de Polignac number, because 20513432400321 - 2⁶ = 20513432400257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20513432400323) 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, 338268615 + ... + 338329251.

It is an arithmetic number, because the mean of its divisors is an integer number (515481212480).

Almost surely, 2^{20513432400321} is an apocalyptic number.

20513432400321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20513432400321 is a deficient number, since it is larger than the sum of its proper divisors (12477365198399).

20513432400321 is a wasteful number, since it uses less digits than its factorization.

20513432400321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62894.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 20513432400321 its reverse (12300423431502), we get a palindrome (32813855831823).

The spelling of 20513432400321 in words is "twenty trillion, five hundred thirteen billion, four hundred thirty-two million, four hundred thousand, three hundred twenty-one".