21102525424 has 40 divisors (see below), whose sum is σ = 41197581440. Its totient is φ = 10471032000.

The previous prime is 21102525419. The next prime is 21102525449. The reversal of 21102525424 is 42452520112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21102525392 and 21102525401.

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, 2825407 + ... + 2832865.

It is an arithmetic number, because the mean of its divisors is an integer number (1029939536).

Almost surely, 2^21102525424 is an apocalyptic number.

It is an amenable number.

21102525424 is a deficient number, since it is larger than the sum of its proper divisors (20095056016).

21102525424 is a wasteful number, since it uses less digits than its factorization.

21102525424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8789 (or 8783 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The spelling of 21102525424 in words is "twenty-one billion, one hundred two million, five hundred twenty-five thousand, four hundred twenty-four".