21434122 has 16 divisors (see below), whose sum is σ = 32739840. Its totient is φ = 10522512.

The previous prime is 21434117. The next prime is 21434123. The reversal of 21434122 is 22143412.

It is a self number, because there is not a number n which added to its sum of digits gives 21434122.

It is not an unprimeable number, because it can be changed into a prime (21434123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46063 + ... + 46525.

It is an arithmetic number, because the mean of its divisors is an integer number (2046240).

Almost surely, 2^21434122 is an apocalyptic number.

21434122 is a deficient number, since it is larger than the sum of its proper divisors (11305718).

21434122 is a wasteful number, since it uses less digits than its factorization.

21434122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837.

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

The square root of 21434122 is about 4629.6999902801. The cubic root of 21434122 is about 277.7805921967.

Adding to 21434122 its reverse (22143412), we get a palindrome (43577534).

It can be divided in two parts, 2143412 and 2, that multiplied together give a palindrome (4286824).

The spelling of 21434122 in words is "twenty-one million, four hundred thirty-four thousand, one hundred twenty-two".