21850011 has 6 divisors (see below), whose sum is σ = 31561140. Its totient is φ = 14566668.

The previous prime is 21849979. The next prime is 21850027. The reversal of 21850011 is 11005812.

It is not a de Polignac number, because 21850011 - 2⁵ = 21849979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21850051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1213881 + ... + 1213898.

It is an arithmetic number, because the mean of its divisors is an integer number (5260190).

Almost surely, 2^21850011 is an apocalyptic number.

21850011 is a deficient number, since it is larger than the sum of its proper divisors (9711129).

21850011 is a wasteful number, since it uses less digits than its factorization.

21850011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427785 (or 2427782 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 21850011 is about 4674.3995336300. The cubic root of 21850011 is about 279.5657000173.

Adding to 21850011 its reverse (11005812), we get a palindrome (32855823).

The spelling of 21850011 in words is "twenty-one million, eight hundred fifty thousand, eleven".