21236465500 has 96 divisors (see below), whose sum is σ = 46826881920. Its totient is φ = 8413286400.

The previous prime is 21236465473. The next prime is 21236465521. The reversal of 21236465500 is 556463212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34643194 + ... + 34643806.

It is an arithmetic number, because the mean of its divisors is an integer number (487780020).

Almost surely, 2^21236465500 is an apocalyptic number.

21236465500 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 21236465500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23413440960).

21236465500 is an abundant number, since it is smaller than the sum of its proper divisors (25590416420).

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

21236465500 is a wasteful number, since it uses less digits than its factorization.

21236465500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184 (or 1172 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 21236465500 in words is "twenty-one billion, two hundred thirty-six million, four hundred sixty-five thousand, five hundred".