21255250412 has 48 divisors (see below), whose sum is σ = 40835642400. Its totient is φ = 9600384000.

The previous prime is 21255250361. The next prime is 21255250417. The reversal of 21255250412 is 21405255212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21255250417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4885214 + ... + 4889562.

It is an arithmetic number, because the mean of its divisors is an integer number (850742550).

Almost surely, 2^21255250412 is an apocalyptic number.

21255250412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21255250412 is a deficient number, since it is larger than the sum of its proper divisors (19580391988).

21255250412 is a wasteful number, since it uses less digits than its factorization.

21255250412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5042 (or 5040 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The spelling of 21255250412 in words is "twenty-one billion, two hundred fifty-five million, two hundred fifty thousand, four hundred twelve".