21852011 has 2 divisors, whose sum is σ = 21852012. Its totient is φ = 21852010.

The previous prime is 21851989. The next prime is 21852013. The reversal of 21852011 is 11025812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21852011 - 2¹⁰ = 21850987 is a prime.

Together with 21852013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21852013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10926005 + 10926006.

It is an arithmetic number, because the mean of its divisors is an integer number (10926006).

Almost surely, 2^21852011 is an apocalyptic number.

21852011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21852011 is an equidigital number, since it uses as much as digits as its factorization.

21852011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 21852011 is about 4674.6134599558. The cubic root of 21852011 is about 279.5742295987.

Adding to 21852011 its reverse (11025812), we get a palindrome (32877823).

The spelling of 21852011 in words is "twenty-one million, eight hundred fifty-two thousand, eleven".