21036151 has 2 divisors, whose sum is σ = 21036152. Its totient is φ = 21036150.

The previous prime is 21036149. The next prime is 21036163. The reversal of 21036151 is 15163012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21036151 - 2¹ = 21036149 is a prime.

Together with 21036149, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21036131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10518075 + 10518076.

It is an arithmetic number, because the mean of its divisors is an integer number (10518076).

Almost surely, 2^21036151 is an apocalyptic number.

21036151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21036151 is an equidigital number, since it uses as much as digits as its factorization.

21036151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 21036151 is about 4586.5183963438. The cubic root of 21036151 is about 276.0506409563.

Adding to 21036151 its reverse (15163012), we get a palindrome (36199163).

The spelling of 21036151 in words is "twenty-one million, thirty-six thousand, one hundred fifty-one".