21527257507 has 8 divisors (see below), whose sum is σ = 25897452800. Its totient is φ = 17480780424.

The previous prime is 21527257483. The next prime is 21527257529. The reversal of 21527257507 is 70575272512.

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 21527257507 - 2¹¹ = 21527255459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21527297507) 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, 80929407 + ... + 80929672.

It is an arithmetic number, because the mean of its divisors is an integer number (3237181600).

Almost surely, 2^21527257507 is an apocalyptic number.

21527257507 is a deficient number, since it is larger than the sum of its proper divisors (4370195293).

21527257507 is a wasteful number, since it uses less digits than its factorization.

21527257507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161859105.

The product of its (nonzero) digits is 343000, while the sum is 43.

The spelling of 21527257507 in words is "twenty-one billion, five hundred twenty-seven million, two hundred fifty-seven thousand, five hundred seven".