21112999985 has 16 divisors (see below), whose sum is σ = 31587242112. Its totient is φ = 13161350400.

The previous prime is 21112999967. The next prime is 21113000003. The reversal of 21112999985 is 58999921112.

It is an interprime number because it is at equal distance from previous prime (21112999967) and next prime (21113000003).

It is not a de Polignac number, because 21112999985 - 2¹⁴ = 21112983601 is a prime.

It is a super-2 number, since 2×21112999985² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112999985.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 27419096 + ... + 27419865.

It is an arithmetic number, because the mean of its divisors is an integer number (1974202632).

Almost surely, 2^21112999985 is an apocalyptic number.

It is an amenable number.

21112999985 is a deficient number, since it is larger than the sum of its proper divisors (10474242127).

21112999985 is a wasteful number, since it uses less digits than its factorization.

21112999985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54838984.

The product of its digits is 1049760, while the sum is 56.

The spelling of 21112999985 in words is "twenty-one billion, one hundred twelve million, nine hundred ninety-nine thousand, nine hundred eighty-five".