21826151 has 2 divisors, whose sum is σ = 21826152. Its totient is φ = 21826150.

The previous prime is 21826141. The next prime is 21826153. The reversal of 21826151 is 15162812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21826151 - 2⁶ = 21826087 is a prime.

It is a Sophie Germain prime.

Together with 21826153, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21826151.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21826153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10913075 + 10913076.

It is an arithmetic number, because the mean of its divisors is an integer number (10913076).

Almost surely, 2^21826151 is an apocalyptic number.

21826151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21826151 is an equidigital number, since it uses as much as digits as its factorization.

21826151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 26.

The square root of 21826151 is about 4671.8466370377. The cubic root of 21826151 is about 279.4639019436.

Adding to 21826151 its reverse (15162812), we get a palindrome (36988963).

The spelling of 21826151 in words is "twenty-one million, eight hundred twenty-six thousand, one hundred fifty-one".