21050234004 has 12 divisors (see below), whose sum is σ = 49117212704. Its totient is φ = 7016744664.

The previous prime is 21050233957. The next prime is 21050234011. The reversal of 21050234004 is 40043205012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21050234004² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 877093072 + ... + 877093095.

Almost surely, 2^21050234004 is an apocalyptic number.

It is an amenable number.

21050234004 is an abundant number, since it is smaller than the sum of its proper divisors (28066978700).

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

21050234004 is a wasteful number, since it uses less digits than its factorization.

21050234004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754186174 (or 1754186172 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

Adding to 21050234004 its reverse (40043205012), we get a palindrome (61093439016).

The spelling of 21050234004 in words is "twenty-one billion, fifty million, two hundred thirty-four thousand, four".