21122434 has 8 divisors (see below), whose sum is σ = 31780368. Its totient is φ = 10528980.

The previous prime is 21122419. The next prime is 21122443. The reversal of 21122434 is 43422112.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15292 + ... + 16615.

It is an arithmetic number, because the mean of its divisors is an integer number (3972546).

Almost surely, 2^21122434 is an apocalyptic number.

21122434 is a deficient number, since it is larger than the sum of its proper divisors (10657934).

21122434 is a wasteful number, since it uses less digits than its factorization.

21122434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32240.

The product of its digits is 384, while the sum is 19.

The square root of 21122434 is about 4595.9149252352. The cubic root of 21122434 is about 276.4275474606.

Adding to 21122434 its reverse (43422112), we get a palindrome (64544546).

The spelling of 21122434 in words is "twenty-one million, one hundred twenty-two thousand, four hundred thirty-four".