21043225524 has 12 divisors (see below), whose sum is σ = 49100859584. Its totient is φ = 7014408504.

The previous prime is 21043225487. The next prime is 21043225579. The reversal of 21043225524 is 42552234012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21043225491 and 21043225500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876801052 + ... + 876801075.

Almost surely, 2^21043225524 is an apocalyptic number.

It is an amenable number.

21043225524 is an abundant number, since it is smaller than the sum of its proper divisors (28057634060).

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

21043225524 is a wasteful number, since it uses less digits than its factorization.

21043225524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753602134 (or 1753602132 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21043225524 its reverse (42552234012), we get a palindrome (63595459536).

The spelling of 21043225524 in words is "twenty-one billion, forty-three million, two hundred twenty-five thousand, five hundred twenty-four".