13031421021 has 16 divisors (see below), whose sum is σ = 19544155520. Its totient is φ = 8687612556.

The previous prime is 13031421001. The next prime is 13031421023. The reversal of 13031421021 is 12012413031.

It is not a de Polignac number, because 13031421021 - 2⁹ = 13031420509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13031420985 and 13031421003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13031421023) 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, 2977105 + ... + 2981478.

It is an arithmetic number, because the mean of its divisors is an integer number (1221509720).

Almost surely, 2^13031421021 is an apocalyptic number.

It is an amenable number.

13031421021 is a deficient number, since it is larger than the sum of its proper divisors (6512734499).

13031421021 is an frugal number, since it uses more digits than its factorization.

13031421021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5958604 (or 5958586 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 13031421021 its reverse (12012413031), we get a palindrome (25043834052).

The spelling of 13031421021 in words is "thirteen billion, thirty-one million, four hundred twenty-one thousand, twenty-one".