21367139691609 has 6 divisors (see below), whose sum is σ = 30863646221226. Its totient is φ = 14244759794400.

The previous prime is 21367139691523. The next prime is 21367139691647. The reversal of 21367139691609 is 90619693176312.

21367139691609 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 7 + 13 + 9 + 6 + 9 + 1 + 609 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12531621240009 + 8835518451600 = 3540003^2 + 2972460^2 .

It is not a de Polignac number, because 21367139691609 - 2⁹ = 21367139691097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21367139695609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1187063316192 + ... + 1187063316209.

It is an arithmetic number, because the mean of its divisors is an integer number (5143941036871).

Almost surely, 2^{21367139691609} is an apocalyptic number.

It is an amenable number.

21367139691609 is a deficient number, since it is larger than the sum of its proper divisors (9496506529617).

21367139691609 is a wasteful number, since it uses less digits than its factorization.

21367139691609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2374126632407 (or 2374126632404 counting only the distinct ones).

The product of its (nonzero) digits is 19840464, while the sum is 63.

The spelling of 21367139691609 in words is "twenty-one trillion, three hundred sixty-seven billion, one hundred thirty-nine million, six hundred ninety-one thousand, six hundred nine".