21636146124 has 36 divisors (see below), whose sum is σ = 54784593864. Its totient is φ = 7199755392.

The previous prime is 21636146101. The next prime is 21636146179. The reversal of 21636146124 is 42164163612.

21636146124 is a `hidden beast` number, since 2 + 1 + 6 + 36 + 1 + 4 + 612 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

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 11 ways as a sum of consecutive naturals, for example, 490797 + ... + 533060.

It is an arithmetic number, because the mean of its divisors is an integer number (1521794274).

Almost surely, 2^21636146124 is an apocalyptic number.

It is an amenable number.

21636146124 is an abundant number, since it is smaller than the sum of its proper divisors (33148447740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21636146124 is a wasteful number, since it uses less digits than its factorization.

21636146124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024454 (or 1024449 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The spelling of 21636146124 in words is "twenty-one billion, six hundred thirty-six million, one hundred forty-six thousand, one hundred twenty-four".