13158021 has 8 divisors (see below), whose sum is σ = 17565984. Its totient is φ = 8761040.

The previous prime is 13157993. The next prime is 13158023. The reversal of 13158021 is 12085131.

13158021 is digitally balanced in base 3, 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13158021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13158023) 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, 655 + ... + 5171.

It is an arithmetic number, because the mean of its divisors is an integer number (2195748).

Almost surely, 2^13158021 is an apocalyptic number.

It is an amenable number.

13158021 is a deficient number, since it is larger than the sum of its proper divisors (4407963).

13158021 is an equidigital number, since it uses as much as digits as its factorization.

13158021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5491.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 13158021 is about 3627.3986546835. The cubic root of 13158021 is about 236.0823529983.

The spelling of 13158021 in words is "thirteen million, one hundred fifty-eight thousand, twenty-one".