21543501300 has 72 divisors (see below), whose sum is σ = 62350238496. Its totient is φ = 5743301760.

The previous prime is 21543501281. The next prime is 21543501319. The reversal of 21543501300 is 310534512.

It is an interprime number because it is at equal distance from previous prime (21543501281) and next prime (21543501319).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1348962 + ... + 1364838.

Almost surely, 2^21543501300 is an apocalyptic number.

21543501300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21543501300 is an abundant number, since it is smaller than the sum of its proper divisors (40806737196).

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

21543501300 is a wasteful number, since it uses less digits than its factorization.

21543501300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20417 (or 20410 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 21543501300 in words is "twenty-one billion, five hundred forty-three million, five hundred one thousand, three hundred".