21434011 has 4 divisors (see below), whose sum is σ = 21565672. Its totient is φ = 21302352.

The previous prime is 21433981. The next prime is 21434027. The reversal of 21434011 is 11043412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21434011 - 2⁷ = 21433883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21434911) by changing a digit.

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, 65586 + ... + 65911.

It is an arithmetic number, because the mean of its divisors is an integer number (5391418).

Almost surely, 2^21434011 is an apocalyptic number.

21434011 is a deficient number, since it is larger than the sum of its proper divisors (131661).

21434011 is a wasteful number, since it uses less digits than its factorization.

21434011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131660.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21434011 is about 4629.6880024468. The cubic root of 21434011 is about 277.7801126856.

Adding to 21434011 its reverse (11043412), we get a palindrome (32477423).

It can be divided in two parts, 214 and 34011, that added together give a square (34225 = 185²).

The spelling of 21434011 in words is "twenty-one million, four hundred thirty-four thousand, eleven".