20121302144 has 32 divisors (see below), whose sum is σ = 40474611840. Its totient is φ = 9962968320.

The previous prime is 20121302143. The next prime is 20121302177. The reversal of 20121302144 is 44120312102.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (20121302143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749912 + ... + 776279.

It is an arithmetic number, because the mean of its divisors is an integer number (1264831620).

Almost surely, 2^20121302144 is an apocalyptic number.

It is an amenable number.

20121302144 is an abundant number, since it is smaller than the sum of its proper divisors (20353309696).

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

20121302144 is a wasteful number, since it uses less digits than its factorization.

20121302144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526308 (or 1526296 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20121302144 its reverse (44120312102), we get a palindrome (64241614246).

The spelling of 20121302144 in words is "twenty billion, one hundred twenty-one million, three hundred two thousand, one hundred forty-four".