20812121142 has 16 divisors (see below), whose sum is σ = 41626690560. Its totient is φ = 6936965672.

The previous prime is 20812121137. The next prime is 20812121171. The reversal of 20812121142 is 24112121802.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19663 + ... + 204965.

It is an arithmetic number, because the mean of its divisors is an integer number (2601668160).

Almost surely, 2^20812121142 is an apocalyptic number.

20812121142 is an abundant number, since it is smaller than the sum of its proper divisors (20814569418).

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

20812121142 is a wasteful number, since it uses less digits than its factorization.

20812121142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204027.

The product of its (nonzero) digits is 512, while the sum is 24.

Adding to 20812121142 its reverse (24112121802), we get a palindrome (44924242944).

The spelling of 20812121142 in words is "twenty billion, eight hundred twelve million, one hundred twenty-one thousand, one hundred forty-two".