21120634248 has 48 divisors (see below), whose sum is σ = 61422256080. Its totient is φ = 6034466592.

The previous prime is 21120634231. The next prime is 21120634321. The reversal of 21120634248 is 84243602112.

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 11 ways as a sum of consecutive naturals, for example, 8978686 + ... + 8981037.

It is an arithmetic number, because the mean of its divisors is an integer number (1279630335).

Almost surely, 2^21120634248 is an apocalyptic number.

21120634248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21120634248 is an abundant number, since it is smaller than the sum of its proper divisors (40301621832).

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

21120634248 is a wasteful number, since it uses less digits than its factorization.

21120634248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17959746 (or 17959735 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The spelling of 21120634248 in words is "twenty-one billion, one hundred twenty million, six hundred thirty-four thousand, two hundred forty-eight".