21284405527 has 48 divisors (see below), whose sum is σ = 27512428032. Its totient is φ = 16279159680.

The previous prime is 21284405507. The next prime is 21284405557. The reversal of 21284405527 is 72550448212.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21284405527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21284405527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21284405507) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8930578 + ... + 8932960.

It is an arithmetic number, because the mean of its divisors is an integer number (573175584).

Almost surely, 2^21284405527 is an apocalyptic number.

21284405527 is a deficient number, since it is larger than the sum of its proper divisors (6228022505).

21284405527 is a wasteful number, since it uses less digits than its factorization.

21284405527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708 (or 2701 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 40.

The spelling of 21284405527 in words is "twenty-one billion, two hundred eighty-four million, four hundred five thousand, five hundred twenty-seven".