20012231321 has 4 divisors (see below), whose sum is σ = 20014416000. Its totient is φ = 20010046644.

The previous prime is 20012231269. The next prime is 20012231341. The reversal of 20012231321 is 12313221002.

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 a de Polignac number, because none of the positive numbers 2^k-20012231321 is a prime.

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 20012231321.

It is not an unprimeable number, because it can be changed into a prime (20012231341) 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, 1078541 + ... + 1096938.

It is an arithmetic number, because the mean of its divisors is an integer number (5003604000).

Almost surely, 2^20012231321 is an apocalyptic number.

It is an amenable number.

20012231321 is a deficient number, since it is larger than the sum of its proper divisors (2184679).

20012231321 is an equidigital number, since it uses as much as digits as its factorization.

20012231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2184678.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20012231321 its reverse (12313221002), we get a palindrome (32325452323).

It can be divided in two parts, 2001 and 2231321, that added together give a palindrome (2233322).

The spelling of 20012231321 in words is "twenty billion, twelve million, two hundred thirty-one thousand, three hundred twenty-one".