21186046357 has 16 divisors (see below), whose sum is σ = 26160105600. Its totient is φ = 17091259584.

The previous prime is 21186046313. The next prime is 21186046369. The reversal of 21186046357 is 75364068112.

It is not a de Polignac number, because 21186046357 - 2⁷ = 21186046229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21186046157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1810843 + ... + 1822504.

It is an arithmetic number, because the mean of its divisors is an integer number (1635006600).

Almost surely, 2^21186046357 is an apocalyptic number.

It is an amenable number.

21186046357 is a deficient number, since it is larger than the sum of its proper divisors (4974059243).

21186046357 is an equidigital number, since it uses as much as digits as its factorization.

21186046357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633385 (or 3633371 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 21186046357 in words is "twenty-one billion, one hundred eighty-six million, forty-six thousand, three hundred fifty-seven".