13021002121 has 4 divisors (see below), whose sum is σ = 13587132672. Its totient is φ = 12454871572.

The previous prime is 13021002103. The next prime is 13021002133. The reversal of 13021002121 is 12120012031.

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: 12120012031 = 13121 ⋅923711.

It is a cyclic number.

It is not a de Polignac number, because 13021002121 - 2¹¹ = 13021000073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13021002101) 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, 283065241 + ... + 283065286.

It is an arithmetic number, because the mean of its divisors is an integer number (3396783168).

Almost surely, 2^13021002121 is an apocalyptic number.

It is an amenable number.

13021002121 is a deficient number, since it is larger than the sum of its proper divisors (566130551).

13021002121 is an equidigital number, since it uses as much as digits as its factorization.

13021002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566130550.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 13021002121 its reverse (12120012031), we get a palindrome (25141014152).

The spelling of 13021002121 in words is "thirteen billion, twenty-one million, two thousand, one hundred twenty-one".