20004352513221 has 32 divisors (see below), whose sum is σ = 27974664506880. Its totient is φ = 12701566485504.

The previous prime is 20004352513213. The next prime is 20004352513237. The reversal of 20004352513221 is 12231525340002.

It is not a de Polignac number, because 20004352513221 - 2³ = 20004352513213 is a prime.

It is a super-2 number, since 2×20004352513221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004352583221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1379181 + ... + 6473858.

It is an arithmetic number, because the mean of its divisors is an integer number (874208265840).

Almost surely, 2^{20004352513221} is an apocalyptic number.

It is an amenable number.

20004352513221 is a deficient number, since it is larger than the sum of its proper divisors (7970311993659).

20004352513221 is a wasteful number, since it uses less digits than its factorization.

20004352513221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7853565.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 20004352513221 its reverse (12231525340002), we get a palindrome (32235877853223).

The spelling of 20004352513221 in words is "twenty trillion, four billion, three hundred fifty-two million, five hundred thirteen thousand, two hundred twenty-one".