21528076371 has 8 divisors (see below), whose sum is σ = 28988301264. Its totient is φ = 14209951200.

The previous prime is 21528076277. The next prime is 21528076393. The reversal of 21528076371 is 17367082512.

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

It is not a de Polignac number, because 21528076371 - 2¹⁸ = 21527814227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21527076371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35524576 + ... + 35525181.

It is an arithmetic number, because the mean of its divisors is an integer number (3623537658).

Almost surely, 2^21528076371 is an apocalyptic number.

21528076371 is a deficient number, since it is larger than the sum of its proper divisors (7460224893).

21528076371 is a wasteful number, since it uses less digits than its factorization.

21528076371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71049861.

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 21528076371 in words is "twenty-one billion, five hundred twenty-eight million, seventy-six thousand, three hundred seventy-one".