20311343221242 has 16 divisors (see below), whose sum is σ = 40691890344672. Its totient is φ = 6758913756720.

The previous prime is 20311343221199. The next prime is 20311343221243. The reversal of 20311343221242 is 24212234311302.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20311343221243) 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, 2883492109 + ... + 2883499152.

It is an arithmetic number, because the mean of its divisors is an integer number (2543243146542).

Almost surely, 2^{20311343221242} is an apocalyptic number.

20311343221242 is an abundant number, since it is smaller than the sum of its proper divisors (20380547123430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20311343221242 is a wasteful number, since it uses less digits than its factorization.

20311343221242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5766991853.

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 20311343221242 its reverse (24212234311302), we get a palindrome (44523577532544).

The spelling of 20311343221242 in words is "twenty trillion, three hundred eleven billion, three hundred forty-three million, two hundred twenty-one thousand, two hundred forty-two".