20001242321 has 4 divisors (see below), whose sum is σ = 20004882432. Its totient is φ = 19997602212.

The previous prime is 20001242299. The next prime is 20001242363. The reversal of 20001242321 is 12324210002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20001242321 - 2¹⁰ = 20001241297 is a prime.

It is a super-2 number, since 2×20001242321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20001242321.

It is not an unprimeable number, because it can be changed into a prime (20001242381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1811801 + ... + 1822806.

It is an arithmetic number, because the mean of its divisors is an integer number (5001220608).

Almost surely, 2^20001242321 is an apocalyptic number.

It is an amenable number.

20001242321 is a deficient number, since it is larger than the sum of its proper divisors (3640111).

20001242321 is an equidigital number, since it uses as much as digits as its factorization.

20001242321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640110.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20001242321 its reverse (12324210002), we get a palindrome (32325452323).

The spelling of 20001242321 in words is "twenty billion, one million, two hundred forty-two thousand, three hundred twenty-one".