21342673065 has 32 divisors (see below), whose sum is σ = 39037685760. Its totient is φ = 9753879744.

The previous prime is 21342673063. The next prime is 21342673087. The reversal of 21342673065 is 56037624312.

It is not a de Polignac number, because 21342673065 - 2¹ = 21342673063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21342673063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 368556 + ... + 422514.

It is an arithmetic number, because the mean of its divisors is an integer number (1219927680).

Almost surely, 2^21342673065 is an apocalyptic number.

It is an amenable number.

21342673065 is a deficient number, since it is larger than the sum of its proper divisors (17695012695).

21342673065 is a wasteful number, since it uses less digits than its factorization.

21342673065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57741.

The product of its (nonzero) digits is 181440, while the sum is 39.

The spelling of 21342673065 in words is "twenty-one billion, three hundred forty-two million, six hundred seventy-three thousand, sixty-five".