21235427576 has 64 divisors (see below), whose sum is σ = 44449620480. Its totient is φ = 9428071680.

The previous prime is 21235427531. The next prime is 21235427581. The reversal of 21235427576 is 67572453212.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2158220 + ... + 2168036.

It is an arithmetic number, because the mean of its divisors is an integer number (694525320).

Almost surely, 2^21235427576 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21235427576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22224810240).

21235427576 is an abundant number, since it is smaller than the sum of its proper divisors (23214192904).

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

21235427576 is a wasteful number, since it uses less digits than its factorization.

21235427576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10404 (or 10400 counting only the distinct ones).

The product of its digits is 705600, while the sum is 44.

The spelling of 21235427576 in words is "twenty-one billion, two hundred thirty-five million, four hundred twenty-seven thousand, five hundred seventy-six".