21010525424 has 40 divisors (see below), whose sum is σ = 47401117920. Its totient is φ = 8834611968.

The previous prime is 21010525411. The next prime is 21010525429. The reversal of 21010525424 is 42452501012.

It is a junction number, because it is equal to n+sod(n) for n = 21010525393 and 21010525402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010525429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1763819 + ... + 1775690.

It is an arithmetic number, because the mean of its divisors is an integer number (1185027948).

Almost surely, 2^21010525424 is an apocalyptic number.

It is an amenable number.

21010525424 is an abundant number, since it is smaller than the sum of its proper divisors (26390592496).

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

21010525424 is a wasteful number, since it uses less digits than its factorization.

21010525424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3539577 (or 3539571 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 21010525424 in words is "twenty-one billion, ten million, five hundred twenty-five thousand, four hundred twenty-four".