20121143242 has 8 divisors (see below), whose sum is σ = 30184593732. Its totient is φ = 10059612000.

The previous prime is 20121143239. The next prime is 20121143243. The reversal of 20121143242 is 24234112102.

It can be written as a sum of positive squares in 2 ways, for example, as 19603080121 + 518063121 = 140011^2 + 22761^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20121143243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453309 + ... + 495712.

Almost surely, 2^20121143242 is an apocalyptic number.

20121143242 is a deficient number, since it is larger than the sum of its proper divisors (10063450490).

20121143242 is a wasteful number, since it uses less digits than its factorization.

20121143242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959624.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 20121143242 its reverse (24234112102), we get a palindrome (44355255344).

The spelling of 20121143242 in words is "twenty billion, one hundred twenty-one million, one hundred forty-three thousand, two hundred forty-two".