21531200511 has 8 divisors (see below), whose sum is σ = 28976569344. Its totient is φ = 14219982680.

The previous prime is 21531200491. The next prime is 21531200549. The reversal of 21531200511 is 11500213512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21531200511 - 2³³ = 12941265919 is a prime.

It is a super-2 number, since 2×21531200511² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531200011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33537375 + ... + 33538016.

It is an arithmetic number, because the mean of its divisors is an integer number (3622071168).

Almost surely, 2^21531200511 is an apocalyptic number.

21531200511 is a deficient number, since it is larger than the sum of its proper divisors (7445368833).

21531200511 is a wasteful number, since it uses less digits than its factorization.

21531200511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67075501.

The product of its (nonzero) digits is 300, while the sum is 21.

The spelling of 21531200511 in words is "twenty-one billion, five hundred thirty-one million, two hundred thousand, five hundred eleven".