13121642 has 4 divisors (see below), whose sum is σ = 19682466. Its totient is φ = 6560820.

The previous prime is 13121639. The next prime is 13121657. The reversal of 13121642 is 24612131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24612131 = 2459 ⋅10009.

It can be written as a sum of positive squares in only one way, i.e., 12397441 + 724201 = 3521^2 + 851^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280409 + ... + 3280412.

Almost surely, 2^13121642 is an apocalyptic number.

13121642 is a deficient number, since it is larger than the sum of its proper divisors (6560824).

13121642 is an equidigital number, since it uses as much as digits as its factorization.

13121642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6560823.

The product of its digits is 288, while the sum is 20.

The square root of 13121642 is about 3622.3807088709. The cubic root of 13121642 is about 235.8645804538.

Adding to 13121642 its reverse (24612131), we get a palindrome (37733773).

The spelling of 13121642 in words is "thirteen million, one hundred twenty-one thousand, six hundred forty-two".