21235836948 has 24 divisors (see below), whose sum is σ = 50229059328. Its totient is φ = 6981644736.

The previous prime is 21235836883. The next prime is 21235836953. The reversal of 21235836948 is 84963853212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21235836948.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 12120036 + ... + 12121787.

It is an arithmetic number, because the mean of its divisors is an integer number (2092877472).

Almost surely, 2^21235836948 is an apocalyptic number.

It is an amenable number.

21235836948 is an abundant number, since it is smaller than the sum of its proper divisors (28993222380).

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

21235836948 is a wasteful number, since it uses less digits than its factorization.

21235836948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24241903 (or 24241901 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 51.

The spelling of 21235836948 in words is "twenty-one billion, two hundred thirty-five million, eight hundred thirty-six thousand, nine hundred forty-eight".