21364541500 has 24 divisors (see below), whose sum is σ = 46660159728. Its totient is φ = 8545816400.

The previous prime is 21364541479. The next prime is 21364541501. The reversal of 21364541500 is 514546312.

It is a happy number.

It is a super-3 number, since 3×21364541500³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364541501) 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, 21364042 + ... + 21365041.

It is an arithmetic number, because the mean of its divisors is an integer number (1944173322).

Almost surely, 2^21364541500 is an apocalyptic number.

21364541500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21364541500 is an abundant number, since it is smaller than the sum of its proper divisors (25295618228).

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

21364541500 is a wasteful number, since it uses less digits than its factorization.

21364541500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42729102 (or 42729090 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 21364541500 in words is "twenty-one billion, three hundred sixty-four million, five hundred forty-one thousand, five hundred".