21113754646 has 12 divisors (see below), whose sum is σ = 32122995156. Its totient is φ = 10408183940.

The previous prime is 21113754619. The next prime is 21113754647. The reversal of 21113754646 is 64645731112.

It is a junction number, because it is equal to n+sod(n) for n = 21113754599 and 21113754608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113754647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1037020 + ... + 1057183.

It is an arithmetic number, because the mean of its divisors is an integer number (2676916263).

Almost surely, 2^21113754646 is an apocalyptic number.

21113754646 is a deficient number, since it is larger than the sum of its proper divisors (11009240510).

21113754646 is an equidigital number, since it uses as much as digits as its factorization.

21113754646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2094347 (or 2094276 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The spelling of 21113754646 in words is "twenty-one billion, one hundred thirteen million, seven hundred fifty-four thousand, six hundred forty-six".