21042534750 has 64 divisors (see below), whose sum is σ = 52935966720. Its totient is φ = 5567133600.

The previous prime is 21042534727. The next prime is 21042534767. The reversal of 21042534750 is 5743524012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15210 + ... + 205709.

It is an arithmetic number, because the mean of its divisors is an integer number (827124480).

Almost surely, 2^21042534750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21042534750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26467983360).

21042534750 is an abundant number, since it is smaller than the sum of its proper divisors (31893431970).

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

21042534750 is a wasteful number, since it uses less digits than its factorization.

21042534750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221066 (or 221056 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The spelling of 21042534750 in words is "twenty-one billion, forty-two million, five hundred thirty-four thousand, seven hundred fifty".