21835038872 has 8 divisors (see below), whose sum is σ = 40940697900. Its totient is φ = 10917519432.

The previous prime is 21835038871. The next prime is 21835038893. The reversal of 21835038872 is 27883053812.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21835038871) by changing a digit.

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, 1364689922 + ... + 1364689937.

Almost surely, 2^21835038872 is an apocalyptic number.

It is an amenable number.

21835038872 is a deficient number, since it is larger than the sum of its proper divisors (19105659028).

21835038872 is a wasteful number, since it uses less digits than its factorization.

21835038872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2729379865 (or 2729379861 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 21835038872 in words is "twenty-one billion, eight hundred thirty-five million, thirty-eight thousand, eight hundred seventy-two".