21143500524 has 96 divisors (see below), whose sum is σ = 56739809280. Its totient is φ = 6801796800.

The previous prime is 21143500519. The next prime is 21143500541. The reversal of 21143500524 is 42500534112.

It is a super-2 number, since 2×21143500524² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 1240339 + ... + 1257269.

It is an arithmetic number, because the mean of its divisors is an integer number (591039680).

Almost surely, 2^21143500524 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21143500524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28369904640).

21143500524 is an abundant number, since it is smaller than the sum of its proper divisors (35596308756).

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

21143500524 is a wasteful number, since it uses less digits than its factorization.

21143500524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17348 (or 17340 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 21143500524 in words is "twenty-one billion, one hundred forty-three million, five hundred thousand, five hundred twenty-four".