21030500524 has 48 divisors (see below), whose sum is σ = 41976216576. Its totient is φ = 9125916800.

The previous prime is 21030500473. The next prime is 21030500549. The reversal of 21030500524 is 42500503012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21030500495 and 21030500504.

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, 507309 + ... + 547195.

It is an arithmetic number, because the mean of its divisors is an integer number (874504512).

Almost surely, 2^21030500524 is an apocalyptic number.

It is an amenable number.

21030500524 is a deficient number, since it is larger than the sum of its proper divisors (20945716052).

21030500524 is a wasteful number, since it uses less digits than its factorization.

21030500524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40446 (or 40444 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The spelling of 21030500524 in words is "twenty-one billion, thirty million, five hundred thousand, five hundred twenty-four".