20121212144 has 20 divisors (see below), whose sum is σ = 42528926040. Its totient is φ = 9146005440.

The previous prime is 20121212117. The next prime is 20121212171. The reversal of 20121212144 is 44121212102.

It is an interprime number because it is at equal distance from previous prime (20121212117) and next prime (20121212171).

It is a congruent number.

It is an unprimeable number.

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, 57162359 + ... + 57162710.

It is an arithmetic number, because the mean of its divisors is an integer number (2126446302).

Almost surely, 2^20121212144 is an apocalyptic number.

It is an amenable number.

20121212144 is an abundant number, since it is smaller than the sum of its proper divisors (22407713896).

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

20121212144 is a wasteful number, since it uses less digits than its factorization.

20121212144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114325088 (or 114325082 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20121212144 its reverse (44121212102), we get a palindrome (64242424246).

The spelling of 20121212144 in words is "twenty billion, one hundred twenty-one million, two hundred twelve thousand, one hundred forty-four".