21057634105 has 16 divisors (see below), whose sum is σ = 25615235520. Its totient is φ = 16616052288.

The previous prime is 21057634099. The next prime is 21057634141. The reversal of 21057634105 is 50143675012.

It is a cyclic number.

It is not a de Polignac number, because 21057634105 - 2³ = 21057634097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215899 + ... + 297871.

It is an arithmetic number, because the mean of its divisors is an integer number (1600952220).

Almost surely, 2^21057634105 is an apocalyptic number.

It is an amenable number.

21057634105 is a deficient number, since it is larger than the sum of its proper divisors (4557601415).

21057634105 is an equidigital number, since it uses as much as digits as its factorization.

21057634105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82680.

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 21057634105 in words is "twenty-one billion, fifty-seven million, six hundred thirty-four thousand, one hundred five".