21051761024 has 96 divisors (see below), whose sum is σ = 49455628200. Its totient is φ = 8898398208.

The previous prime is 21051760979. The next prime is 21051761051. The reversal of 21051761024 is 42016715012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 434867 + ... + 480845.

Almost surely, 2^21051761024 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 21051761024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24727814100).

21051761024 is an abundant number, since it is smaller than the sum of its proper divisors (28403867176).

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

21051761024 is an equidigital number, since it uses as much as digits as its factorization.

21051761024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46080 (or 46061 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The spelling of 21051761024 in words is "twenty-one billion, fifty-one million, seven hundred sixty-one thousand, twenty-four".