21312211848 has 32 divisors (see below), whose sum is σ = 53588520000. Its totient is φ = 7063005248.

The previous prime is 21312211841. The next prime is 21312211867. The reversal of 21312211848 is 84811221312.

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

It is not an unprimeable number, because it can be changed into a prime (21312211841) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2562348 + ... + 2570651.

It is an arithmetic number, because the mean of its divisors is an integer number (1674641250).

Almost surely, 2^21312211848 is an apocalyptic number.

It is an amenable number.

21312211848 is an abundant number, since it is smaller than the sum of its proper divisors (32276308152).

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

21312211848 is a wasteful number, since it uses less digits than its factorization.

21312211848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5133181 (or 5133177 counting only the distinct ones).

The product of its digits is 6144, while the sum is 33.

The spelling of 21312211848 in words is "twenty-one billion, three hundred twelve million, two hundred eleven thousand, eight hundred forty-eight".