21291964848 has 120 divisors (see below), whose sum is σ = 74291483136. Its totient is φ = 5530377600.

The previous prime is 21291964747. The next prime is 21291964853. The reversal of 21291964848 is 84846919212.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21291964794 and 21291964803.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 949048 + ... + 971223.

Almost surely, 2^21291964848 is an apocalyptic number.

21291964848 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21291964848 is an abundant number, since it is smaller than the sum of its proper divisors (52999518288).

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

21291964848 is a wasteful number, since it uses less digits than its factorization.

21291964848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920303 (or 1920294 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The spelling of 21291964848 in words is "twenty-one billion, two hundred ninety-one million, nine hundred sixty-four thousand, eight hundred forty-eight".