21424035 has 16 divisors (see below), whose sum is σ = 34365600. Its totient is φ = 11397120.

The previous prime is 21424027. The next prime is 21424049. The reversal of 21424035 is 53042412.

It is not a de Polignac number, because 21424035 - 2³ = 21424027 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5145 + ... + 8325.

It is an arithmetic number, because the mean of its divisors is an integer number (2147850).

Almost surely, 2^21424035 is an apocalyptic number.

21424035 is a deficient number, since it is larger than the sum of its proper divisors (12941565).

21424035 is a wasteful number, since it uses less digits than its factorization.

21424035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21424035 is about 4628.6104826395. The cubic root of 21424035 is about 277.7370104024.

Adding to 21424035 its reverse (53042412), we get a palindrome (74466447).

The spelling of 21424035 in words is "twenty-one million, four hundred twenty-four thousand, thirty-five".