21140020232 has 8 divisors (see below), whose sum is σ = 39637537950. Its totient is φ = 10570010112.

The previous prime is 21140020201. The next prime is 21140020261. The reversal of 21140020232 is 23202004112.

It can be written as a sum of positive squares in only one way, i.e., 15611502916 + 5528517316 = 124946^2 + 74354^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21140020232.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321251257 + ... + 1321251272.

Almost surely, 2^21140020232 is an apocalyptic number.

It is an amenable number.

21140020232 is a deficient number, since it is larger than the sum of its proper divisors (18497517718).

21140020232 is a wasteful number, since it uses less digits than its factorization.

21140020232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2642502535 (or 2642502531 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21140020232 its reverse (23202004112), we get a palindrome (44342024344).

The spelling of 21140020232 in words is "twenty-one billion, one hundred forty million, twenty thousand, two hundred thirty-two".