21368136361 has 16 divisors (see below), whose sum is σ = 26195299200. Its totient is φ = 17151678720.

The previous prime is 21368136341. The next prime is 21368136373. The reversal of 21368136361 is 16363186312.

It is not a de Polignac number, because 21368136361 - 2⁷ = 21368136233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21368136341) by changing a digit.

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, 3245136 + ... + 3251713.

It is an arithmetic number, because the mean of its divisors is an integer number (1637206200).

Almost surely, 2^21368136361 is an apocalyptic number.

It is an amenable number.

21368136361 is a deficient number, since it is larger than the sum of its proper divisors (4827162839).

21368136361 is a wasteful number, since it uses less digits than its factorization.

21368136361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6496896.

The product of its digits is 93312, while the sum is 40.

The spelling of 21368136361 in words is "twenty-one billion, three hundred sixty-eight million, one hundred thirty-six thousand, three hundred sixty-one".