21601234 has 8 divisors (see below), whose sum is σ = 33447168. Its totient is φ = 10452180.

The previous prime is 21601189. The next prime is 21601277. The reversal of 21601234 is 43210612.

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

It is a super-2 number, since 2×21601234² = 933226620645512, which contains 22 as substring.

It is an unprimeable number.

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, 174142 + ... + 174265.

It is an arithmetic number, because the mean of its divisors is an integer number (4180896).

Almost surely, 2^21601234 is an apocalyptic number.

21601234 is a deficient number, since it is larger than the sum of its proper divisors (11845934).

21601234 is a wasteful number, since it uses less digits than its factorization.

21601234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348440.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21601234 is about 4647.7127708153. The cubic root of 21601234 is about 278.5006333608.

Adding to 21601234 its reverse (43210612), we get a palindrome (64811846).

The spelling of 21601234 in words is "twenty-one million, six hundred one thousand, two hundred thirty-four".