21434124 has 24 divisors (see below), whose sum is σ = 51177280. Its totient is φ = 6978384.

The previous prime is 21434123. The next prime is 21434131. The reversal of 21434124 is 42143412.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21434124.

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, 20254 + ... + 21285.

Almost surely, 2^21434124 is an apocalyptic number.

It is an amenable number.

21434124 is an abundant number, since it is smaller than the sum of its proper divisors (29743156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21434124 is a wasteful number, since it uses less digits than its factorization.

21434124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41589 (or 41587 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 21434124 is about 4629.7002062769. The cubic root of 21434124 is about 277.7806008365.

Adding to 21434124 its reverse (42143412), we get a palindrome (63577536).

The spelling of 21434124 in words is "twenty-one million, four hundred thirty-four thousand, one hundred twenty-four".