21433413 has 8 divisors (see below), whose sum is σ = 30259008. Its totient is φ = 13448384.

The previous prime is 21433361. The next prime is 21433417. The reversal of 21433413 is 31433412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21433413 - 2²² = 17239109 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21433413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210081 + ... + 210182.

It is an arithmetic number, because the mean of its divisors is an integer number (3782376).

Almost surely, 2^21433413 is an apocalyptic number.

It is an amenable number.

21433413 is a deficient number, since it is larger than the sum of its proper divisors (8825595).

21433413 is a wasteful number, since it uses less digits than its factorization.

21433413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420283.

The product of its digits is 864, while the sum is 21.

The square root of 21433413 is about 4629.6234188106. The cubic root of 21433413 is about 277.7775293450. Note that the first 3 decimals are identical.

Adding to 21433413 its reverse (31433412), we get a palindrome (52866825).

Subtracting 21433413 from its reverse (31433412), we obtain a palindrome (9999999).

The spelling of 21433413 in words is "twenty-one million, four hundred thirty-three thousand, four hundred thirteen".