21346086609 has 27 divisors (see below), whose sum is σ = 31880234217. Its totient is φ = 13762902600.

The previous prime is 21346086589. The next prime is 21346086611. The reversal of 21346086609 is 90668064312.

The square root of 21346086609 is 146103.

It is a perfect power (a square), and thus also a powerful number.

21346086609 is a `hidden beast` number, since 2 + 1 + 34 + 6 + 0 + 8 + 6 + 609 = 666.

It is not a de Polignac number, because 21346086609 - 2⁷ = 21346086481 is a prime.

It is a super-4 number, since 4×21346086609⁴ (a number of 42 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21346086649) 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 26 ways as a sum of consecutive naturals, for example, 13586794 + ... + 13588364.

Almost surely, 2^21346086609 is an apocalyptic number.

21346086609 is the 146103-rd square number.

21346086609 is the 73052-nd centered octagonal number.

It is an amenable number.

21346086609 is a deficient number, since it is larger than the sum of its proper divisors (10534147608).

21346086609 is an frugal number, since it uses more digits than its factorization.

21346086609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210 (or 1605 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 21346086609 in words is "twenty-one billion, three hundred forty-six million, eighty-six thousand, six hundred nine".