20031012321 has 16 divisors (see below), whose sum is σ = 26947660608. Its totient is φ = 13234457600.

The previous prime is 20031012299. The next prime is 20031012341. The reversal of 20031012321 is 12321013002.

It is a cyclic number.

It is not a de Polignac number, because 20031012321 - 2¹⁸ = 20030750177 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20031012321.

It is not an unprimeable number, because it can be changed into a prime (20031012341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265585 + ... + 332561.

It is an arithmetic number, because the mean of its divisors is an integer number (1684228788).

Almost surely, 2^20031012321 is an apocalyptic number.

It is an amenable number.

20031012321 is a deficient number, since it is larger than the sum of its proper divisors (6916648287).

20031012321 is a wasteful number, since it uses less digits than its factorization.

20031012321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67872.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20031012321 its reverse (12321013002), we get a palindrome (32352025323).

The spelling of 20031012321 in words is "twenty billion, thirty-one million, twelve thousand, three hundred twenty-one".