21136413 has 8 divisors (see below), whose sum is σ = 28244608. Its totient is φ = 14059584.

The previous prime is 21136403. The next prime is 21136429. The reversal of 21136413 is 31463112.

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

It is not a de Polignac number, because 21136413 - 2⁹ = 21135901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21136413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21136403) 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, 6220 + ... + 8997.

It is an arithmetic number, because the mean of its divisors is an integer number (3530576).

Almost surely, 2^21136413 is an apocalyptic number.

It is an amenable number.

21136413 is a deficient number, since it is larger than the sum of its proper divisors (7108195).

21136413 is a wasteful number, since it uses less digits than its factorization.

21136413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15683.

The product of its digits is 432, while the sum is 21.

The square root of 21136413 is about 4597.4354807871. The cubic root of 21136413 is about 276.4885146854.

Adding to 21136413 its reverse (31463112), we get a palindrome (52599525).

The spelling of 21136413 in words is "twenty-one million, one hundred thirty-six thousand, four hundred thirteen".