13020400021 has 4 divisors (see below), whose sum is σ = 13022290944. Its totient is φ = 13018509100.

The previous prime is 13020400007. The next prime is 13020400031. The reversal of 13020400021 is 12000402031.

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 13020400021 - 2⁷ = 13020399893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13020399974 and 13020400010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13020400031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 935095 + ... + 948916.

It is an arithmetic number, because the mean of its divisors is an integer number (3255572736).

Almost surely, 2^13020400021 is an apocalyptic number.

It is an amenable number.

13020400021 is a deficient number, since it is larger than the sum of its proper divisors (1890923).

13020400021 is an equidigital number, since it uses as much as digits as its factorization.

13020400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1890922.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 13020400021 its reverse (12000402031), we get a palindrome (25020802052).

The spelling of 13020400021 in words is "thirteen billion, twenty million, four hundred thousand, twenty-one".