13121452021 has 4 divisors (see below), whose sum is σ = 13426602112. Its totient is φ = 12816301932.

The previous prime is 13121452007. The next prime is 13121452033. The reversal of 13121452021 is 12025412131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12025412131 = 3089 ⋅3892979.

It is a cyclic number.

It is not a de Polignac number, because 13121452021 - 2¹¹ = 13121449973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13121451983 and 13121452001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121452081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152574981 + ... + 152575066.

It is an arithmetic number, because the mean of its divisors is an integer number (3356650528).

Almost surely, 2^13121452021 is an apocalyptic number.

It is an amenable number.

13121452021 is a deficient number, since it is larger than the sum of its proper divisors (305150091).

13121452021 is an equidigital number, since it uses as much as digits as its factorization.

13121452021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305150090.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 13121452021 its reverse (12025412131), we get a palindrome (25146864152).

The spelling of 13121452021 in words is "thirteen billion, one hundred twenty-one million, four hundred fifty-two thousand, twenty-one".