21634100205715 has 16 divisors (see below), whose sum is σ = 26023099939200. Its totient is φ = 17265828666240.

The previous prime is 21634100205713. The next prime is 21634100205721. The reversal of 21634100205715 is 51750200143612.

It is not a de Polignac number, because 21634100205715 - 2¹ = 21634100205713 is a prime.

It is a super-2 number, since 2×21634100205715² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21634100205713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198061686 + ... + 198170884.

It is an arithmetic number, because the mean of its divisors is an integer number (1626443746200).

Almost surely, 2^{21634100205715} is an apocalyptic number.

21634100205715 is a deficient number, since it is larger than the sum of its proper divisors (4388999733485).

21634100205715 is a wasteful number, since it uses less digits than its factorization.

21634100205715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203742.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 21634100205715 in words is "twenty-one trillion, six hundred thirty-four billion, one hundred million, two hundred five thousand, seven hundred fifteen".