21327575538 has 8 divisors (see below), whose sum is σ = 42655151088. Its totient is φ = 7109191844.

The previous prime is 21327575519. The next prime is 21327575543. The reversal of 21327575538 is 83557572312.

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

21327575538 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1777297956 + ... + 1777297967.

It is an arithmetic number, because the mean of its divisors is an integer number (5331893886).

Almost surely, 2^21327575538 is an apocalyptic number.

21327575538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21327575538 is a wasteful number, since it uses less digits than its factorization.

21327575538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3554595928.

The product of its digits is 1764000, while the sum is 48.

The spelling of 21327575538 in words is "twenty-one billion, three hundred twenty-seven million, five hundred seventy-five thousand, five hundred thirty-eight".