21011910930 has 24 divisors (see below), whose sum is σ = 54630968652. Its totient is φ = 5603176224.

The previous prime is 21011910923. The next prime is 21011910979. The reversal of 21011910930 is 3901911012.

It can be written as a sum of positive squares in 2 ways, for example, as 20936064249 + 75846681 = 144693^2 + 8709^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21011910894 and 21011910903.

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, 116732749 + ... + 116732928.

Almost surely, 2^21011910930 is an apocalyptic number.

21011910930 is an abundant number, since it is smaller than the sum of its proper divisors (33619057722).

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

21011910930 is a wasteful number, since it uses less digits than its factorization.

21011910930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233465690 (or 233465687 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The spelling of 21011910930 in words is "twenty-one billion, eleven million, nine hundred ten thousand, nine hundred thirty".