21751404312 has 128 divisors (see below), whose sum is σ = 60370675200. Its totient is φ = 6529818240.

The previous prime is 21751404287. The next prime is 21751404319. The reversal of 21751404312 is 21340415712.

It is a self number, because there is not a number n which added to its sum of digits gives 21751404312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21751404319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3478773 + ... + 3485019.

It is an arithmetic number, because the mean of its divisors is an integer number (471645900).

Almost surely, 2^21751404312 is an apocalyptic number.

21751404312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21751404312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30185337600).

21751404312 is an abundant number, since it is smaller than the sum of its proper divisors (38619270888).

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

21751404312 is a wasteful number, since it uses less digits than its factorization.

21751404312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6398 (or 6372 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The spelling of 21751404312 in words is "twenty-one billion, seven hundred fifty-one million, four hundred four thousand, three hundred twelve".