21950011 has 2 divisors, whose sum is σ = 21950012. Its totient is φ = 21950010.

The previous prime is 21949973. The next prime is 21950017. The reversal of 21950011 is 11005912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21950011 - 2¹¹ = 21947963 is a prime.

It is not a weakly prime, because it can be changed into another prime (21950017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10975005 + 10975006.

It is an arithmetic number, because the mean of its divisors is an integer number (10975006).

Almost surely, 2^21950011 is an apocalyptic number.

21950011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21950011 is an equidigital number, since it uses as much as digits as its factorization.

21950011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 21950011 is about 4685.0838839876. The cubic root of 21950011 is about 279.9915431119.

Adding to 21950011 its reverse (11005912), we get a palindrome (32955923).

The spelling of 21950011 in words is "twenty-one million, nine hundred fifty thousand, eleven".