13070921 has 4 divisors (see below), whose sum is σ = 13117392. Its totient is φ = 13024452.

The previous prime is 13070903. The next prime is 13070983. The reversal of 13070921 is 12907031.

13070921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 12907031 = 1433 ⋅9007.

It is a cyclic number.

It is not a de Polignac number, because 13070921 - 2¹⁰ = 13069897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13070221) 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, 22811 + ... + 23376.

It is an arithmetic number, because the mean of its divisors is an integer number (3279348).

Almost surely, 2^13070921 is an apocalyptic number.

It is an amenable number.

13070921 is a deficient number, since it is larger than the sum of its proper divisors (46471).

13070921 is an equidigital number, since it uses as much as digits as its factorization.

13070921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46470.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 13070921 is about 3615.3728715030. The cubic root of 13070921 is about 235.5602807568.

Adding to 13070921 its reverse (12907031), we get a palindrome (25977952).

The spelling of 13070921 in words is "thirteen million, seventy thousand, nine hundred twenty-one".