21528976446 has 16 divisors (see below), whose sum is σ = 47842170000. Its totient is φ = 7176325464.

The previous prime is 21528976429. The next prime is 21528976451. The reversal of 21528976446 is 64467982512.

21528976446 is a `hidden beast` number, since 2 + 1 + 52 + 89 + 76 + 446 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 398684749 = 21528976446 / (2 + 1 + 5 + 2 + 8 + 9 + 7 + 6 + 4 + 4 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 21528976392 and 21528976401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199342321 + ... + 199342428.

It is an arithmetic number, because the mean of its divisors is an integer number (2990135625).

Almost surely, 2^21528976446 is an apocalyptic number.

21528976446 is an abundant number, since it is smaller than the sum of its proper divisors (26313193554).

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

21528976446 is a wasteful number, since it uses less digits than its factorization.

21528976446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398684760 (or 398684754 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 21528976446 in words is "twenty-one billion, five hundred twenty-eight million, nine hundred seventy-six thousand, four hundred forty-six".