21142120360 has 16 divisors (see below), whose sum is σ = 47569770900. Its totient is φ = 8456848128.

The previous prime is 21142120339. The next prime is 21142120361. The reversal of 21142120360 is 6302124112.

It can be written as a sum of positive squares in 2 ways, for example, as 20810370564 + 331749796 = 144258^2 + 18214^2 .

It is not an unprimeable number, because it can be changed into a prime (21142120361) 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, 264276465 + ... + 264276544.

Almost surely, 2^21142120360 is an apocalyptic number.

21142120360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21142120360 is an abundant number, since it is smaller than the sum of its proper divisors (26427650540).

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

21142120360 is a wasteful number, since it uses less digits than its factorization.

21142120360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528553020 (or 528553016 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21142120360 its reverse (6302124112), we get a palindrome (27444244472).

The spelling of 21142120360 in words is "twenty-one billion, one hundred forty-two million, one hundred twenty thousand, three hundred sixty".