21751353500 has 96 divisors (see below), whose sum is σ = 48467607552. Its totient is φ = 8525966400.

The previous prime is 21751353493. The next prime is 21751353509. The reversal of 21751353500 is 535315712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21751353509) 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, 5268437 + ... + 5272563.

It is an arithmetic number, because the mean of its divisors is an integer number (504870912).

Almost surely, 2^21751353500 is an apocalyptic number.

21751353500 is a gapful number since it is divisible by the number (20) 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 21751353500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24233803776).

21751353500 is an abundant number, since it is smaller than the sum of its proper divisors (26716254052).

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

21751353500 is a wasteful number, since it uses less digits than its factorization.

21751353500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4356 (or 4344 counting only the distinct ones).

The product of its (nonzero) digits is 15750, while the sum is 32.

The spelling of 21751353500 in words is "twenty-one billion, seven hundred fifty-one million, three hundred fifty-three thousand, five hundred".