13020000021 has 48 divisors (see below), whose sum is σ = 23462566400. Its totient is φ = 7048403568.

The previous prime is 13020000013. The next prime is 13020000043. The reversal of 13020000021 is 12000002031.

It is a happy number.

It is not a de Polignac number, because 13020000021 - 2³ = 13020000013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13019999958 and 13020000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13020000061) 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, 169111 + ... + 233748.

Almost surely, 2^13020000021 is an apocalyptic number.

It is an amenable number.

13020000021 is a deficient number, since it is larger than the sum of its proper divisors (10442566379).

13020000021 is an equidigital number, since it uses as much as digits as its factorization.

13020000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402900 (or 402888 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 13020000021 its reverse (12000002031), we get a palindrome (25020002052).

The spelling of 13020000021 in words is "thirteen billion, twenty million, twenty-one", and thus it is an aban number and an uban number.