21434136 has 32 divisors (see below), whose sum is σ = 53829360. Its totient is φ = 7112192.

The previous prime is 21434131. The next prime is 21434143. The reversal of 21434136 is 63143412.

It is a Harshad number since it is a multiple of its sum of digits (24).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434131) 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, 3676 + ... + 7508.

Almost surely, 2^21434136 is an apocalyptic number.

It is an amenable number.

21434136 is an abundant number, since it is smaller than the sum of its proper divisors (32395224).

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

21434136 is a wasteful number, since it uses less digits than its factorization.

21434136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4075 (or 4071 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

The square root of 21434136 is about 4629.7015022569. The cubic root of 21434136 is about 277.7806526754.

Adding to 21434136 its reverse (63143412), we get a palindrome (84577548).

The spelling of 21434136 in words is "twenty-one million, four hundred thirty-four thousand, one hundred thirty-six".