13121421 has 8 divisors (see below), whose sum is σ = 17968224. Its totient is φ = 8511120.

The previous prime is 13121417. The next prime is 13121429. The reversal of 13121421 is 12412131.

13121421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13121421 - 2² = 13121417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13121421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58995 + ... + 59216.

It is an arithmetic number, because the mean of its divisors is an integer number (2246028).

Almost surely, 2^13121421 is an apocalyptic number.

It is an amenable number.

13121421 is a deficient number, since it is larger than the sum of its proper divisors (4846803).

13121421 is a wasteful number, since it uses less digits than its factorization.

13121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118251.

The product of its digits is 48, while the sum is 15.

The square root of 13121421 is about 3622.3502039422. The cubic root of 13121421 is about 235.8632562708.

Adding to 13121421 its reverse (12412131), we get a palindrome (25533552).

The spelling of 13121421 in words is "thirteen million, one hundred twenty-one thousand, four hundred twenty-one".