21151634105 has 16 divisors (see below), whose sum is σ = 29015262720. Its totient is φ = 14500324032.

The previous prime is 21151634093. The next prime is 21151634123. The reversal of 21151634105 is 50143615112.

It is a cyclic number.

It is not a de Polignac number, because 21151634105 - 2⁴ = 21151634089 is a prime.

It is an unprimeable number.

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, 68687 + ... + 216843.

It is an arithmetic number, because the mean of its divisors is an integer number (1813453920).

Almost surely, 2^21151634105 is an apocalyptic number.

It is an amenable number.

21151634105 is a deficient number, since it is larger than the sum of its proper divisors (7863628615).

21151634105 is a wasteful number, since it uses less digits than its factorization.

21151634105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152248.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 21151634105 in words is "twenty-one billion, one hundred fifty-one million, six hundred thirty-four thousand, one hundred five".