21340147186 has 16 divisors (see below), whose sum is σ = 32338651608. Its totient is φ = 10560672000.

The previous prime is 21340147177. The next prime is 21340147187. The reversal of 21340147186 is 68174104312.

It can be written as a sum of positive squares in 4 ways, for example, as 18043205625 + 3296941561 = 134325^2 + 57419^2 .

It is not an unprimeable number, because it can be changed into a prime (21340147187) 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 7 ways as a sum of consecutive naturals, for example, 601066 + ... + 635578.

Almost surely, 2^21340147186 is an apocalyptic number.

21340147186 is a deficient number, since it is larger than the sum of its proper divisors (10998504422).

21340147186 is a wasteful number, since it uses less digits than its factorization.

21340147186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37677.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 21340147186 in words is "twenty-one billion, three hundred forty million, one hundred forty-seven thousand, one hundred eighty-six".