21150762424 has 128 divisors (see below), whose sum is σ = 44721331200. Its totient is φ = 9297699840.

The previous prime is 21150762403. The next prime is 21150762497. The reversal of 21150762424 is 42426705112.

It is a super-2 number, since 2×21150762424² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21150762424.

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, 126651189 + ... + 126651355.

It is an arithmetic number, because the mean of its divisors is an integer number (349385400).

Almost surely, 2^21150762424 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 21150762424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22360665600).

21150762424 is an abundant number, since it is smaller than the sum of its proper divisors (23570568776).

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

21150762424 is a wasteful number, since it uses less digits than its factorization.

21150762424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The spelling of 21150762424 in words is "twenty-one billion, one hundred fifty million, seven hundred sixty-two thousand, four hundred twenty-four".