21872673 has 12 divisors (see below), whose sum is σ = 32764368. Its totient is φ = 14581620.

The previous prime is 21872663. The next prime is 21872689. The reversal of 21872673 is 37627812.

It is not a de Polignac number, because 21872673 - 2²² = 17678369 is a prime.

21872673 is a modest number, since divided by 2673 gives 2187 as remainder.

It is not an unprimeable number, because it can be changed into a prime (21872603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44763 + ... + 45248.

It is an arithmetic number, because the mean of its divisors is an integer number (2730364).

Almost surely, 2^21872673 is an apocalyptic number.

It is an amenable number.

21872673 is a deficient number, since it is larger than the sum of its proper divisors (10891695).

21872673 is an frugal number, since it uses more digits than its factorization.

21872673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90026 (or 90014 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 21872673 is about 4676.8229600873. The cubic root of 21872673 is about 279.6623182576.

The spelling of 21872673 in words is "twenty-one million, eight hundred seventy-two thousand, six hundred seventy-three".