21355234 has 8 divisors (see below), whose sum is σ = 32065488. Its totient is φ = 10666740.

The previous prime is 21355231. The next prime is 21355241. The reversal of 21355234 is 43255312.

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

It is a junction number, because it is equal to n+sod(n) for n = 21355199 and 21355208.

It is not an unprimeable number, because it can be changed into a prime (21355231) 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 3 ways as a sum of consecutive naturals, for example, 2712 + ... + 7075.

It is an arithmetic number, because the mean of its divisors is an integer number (4008186).

Almost surely, 2^21355234 is an apocalyptic number.

21355234 is a deficient number, since it is larger than the sum of its proper divisors (10710254).

21355234 is a wasteful number, since it uses less digits than its factorization.

21355234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10880.

The product of its digits is 3600, while the sum is 25.

The square root of 21355234 is about 4621.1723620744. The cubic root of 21355234 is about 277.4393839953.

The spelling of 21355234 in words is "twenty-one million, three hundred fifty-five thousand, two hundred thirty-four".