20013121241242 has 4 divisors (see below), whose sum is σ = 30019681861866. Its totient is φ = 10006560620620.

The previous prime is 20013121241143. The next prime is 20013121241257. The reversal of 20013121241242 is 24214212131002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19117260884241 + 895860357001 = 4372329^2 + 946499^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5003280310309 + ... + 5003280310312.

Almost surely, 2^{20013121241242} is an apocalyptic number.

20013121241242 is a deficient number, since it is larger than the sum of its proper divisors (10006560620624).

20013121241242 is a wasteful number, since it uses less digits than its factorization.

20013121241242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10006560620623.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 20013121241242 its reverse (24214212131002), we get a palindrome (44227333372244).

The spelling of 20013121241242 in words is "twenty trillion, thirteen billion, one hundred twenty-one million, two hundred forty-one thousand, two hundred forty-two".