21234671867 has 8 divisors (see below), whose sum is σ = 21556036176. Its totient is φ = 20913437952.

The previous prime is 21234671851. The next prime is 21234671873. The reversal of 21234671867 is 76817643212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21234671867 - 2⁴ = 21234671851 is a prime.

It is a super-2 number, since 2×21234671867² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234671837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324983 + ... + 384815.

It is an arithmetic number, because the mean of its divisors is an integer number (2694504522).

Almost surely, 2^21234671867 is an apocalyptic number.

21234671867 is a deficient number, since it is larger than the sum of its proper divisors (321364309).

21234671867 is an equidigital number, since it uses as much as digits as its factorization.

21234671867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65197.

The product of its digits is 677376, while the sum is 47.

The spelling of 21234671867 in words is "twenty-one billion, two hundred thirty-four million, six hundred seventy-one thousand, eight hundred sixty-seven".