13020021231 has 48 divisors (see below), whose sum is σ = 20738360160. Its totient is φ = 7242117120.

The previous prime is 13020021191. The next prime is 13020021241. The reversal of 13020021231 is 13212002031.

It is not a de Polignac number, because 13020021231 - 2⁶ = 13020021167 is a prime.

It is a super-2 number, since 2×13020021231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13020021231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13020021241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 862315 + ... + 877283.

It is an arithmetic number, because the mean of its divisors is an integer number (432049170).

Almost surely, 2^13020021231 is an apocalyptic number.

13020021231 is a deficient number, since it is larger than the sum of its proper divisors (7718338929).

13020021231 is a wasteful number, since it uses less digits than its factorization.

13020021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15144 (or 15137 counting only the distinct ones).

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

Adding to 13020021231 its reverse (13212002031), we get a palindrome (26232023262).

The spelling of 13020021231 in words is "thirteen billion, twenty million, twenty-one thousand, two hundred thirty-one".