21142302308 has 6 divisors (see below), whose sum is σ = 36999029046. Its totient is φ = 10571151152.

The previous prime is 21142302301. The next prime is 21142302341. The reversal of 21142302308 is 80320324112.

It can be written as a sum of positive squares in only one way, i.e., 20807485504 + 334816804 = 144248^2 + 18298^2 .

It is not an unprimeable number, because it can be changed into a prime (21142302301) by changing a digit.

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 as a sum of consecutive naturals, namely, 2642787785 + ... + 2642787792.

It is an arithmetic number, because the mean of its divisors is an integer number (6166504841).

Almost surely, 2^21142302308 is an apocalyptic number.

It is an amenable number.

21142302308 is a deficient number, since it is larger than the sum of its proper divisors (15856726738).

21142302308 is a wasteful number, since it uses less digits than its factorization.

21142302308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5285575581 (or 5285575579 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 21142302308 in words is "twenty-one billion, one hundred forty-two million, three hundred two thousand, three hundred eight".