21327533501 has 4 divisors (see below), whose sum is σ = 21526856352. Its totient is φ = 21128210652.

The previous prime is 21327533473. The next prime is 21327533551. The reversal of 21327533501 is 10533572312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21327533501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327533551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99661265 + ... + 99661478.

It is an arithmetic number, because the mean of its divisors is an integer number (5381714088).

Almost surely, 2^21327533501 is an apocalyptic number.

It is an amenable number.

21327533501 is a deficient number, since it is larger than the sum of its proper divisors (199322851).

21327533501 is a wasteful number, since it uses less digits than its factorization.

21327533501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199322850.

The product of its (nonzero) digits is 18900, while the sum is 32.

The spelling of 21327533501 in words is "twenty-one billion, three hundred twenty-seven million, five hundred thirty-three thousand, five hundred one".