21934231 has 8 divisors (see below), whose sum is σ = 23990400. Its totient is φ = 19888440.

The previous prime is 21934223. The next prime is 21934277. The reversal of 21934231 is 13243912.

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

It is not a de Polignac number, because 21934231 - 2³ = 21934223 is a prime.

It is a super-2 number, since 2×21934231² = 962220979122722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21934196 and 21934205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21934201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2230 + ... + 6988.

It is an arithmetic number, because the mean of its divisors is an integer number (2998800).

Almost surely, 2^21934231 is an apocalyptic number.

21934231 is a deficient number, since it is larger than the sum of its proper divisors (2056169).

21934231 is a wasteful number, since it uses less digits than its factorization.

21934231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5189.

The product of its digits is 1296, while the sum is 25.

The square root of 21934231 is about 4683.3995131742. The cubic root of 21934231 is about 279.9244311373.

The spelling of 21934231 in words is "twenty-one million, nine hundred thirty-four thousand, two hundred thirty-one".