21115351527 has 8 divisors (see below), whose sum is σ = 28685006064. Its totient is φ = 13811299008.

The previous prime is 21115351513. The next prime is 21115351571. The reversal of 21115351527 is 72515351112.

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

It is not a de Polignac number, because 21115351527 - 2²⁷ = 20981133799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115352527) 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, 66400318 + ... + 66400635.

It is an arithmetic number, because the mean of its divisors is an integer number (3585625758).

Almost surely, 2^21115351527 is an apocalyptic number.

21115351527 is a deficient number, since it is larger than the sum of its proper divisors (7569654537).

21115351527 is a wasteful number, since it uses less digits than its factorization.

21115351527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132801009.

The product of its digits is 10500, while the sum is 33.

The spelling of 21115351527 in words is "twenty-one billion, one hundred fifteen million, three hundred fifty-one thousand, five hundred twenty-seven".