21202011 has 12 divisors (see below), whose sum is σ = 30693000. Its totient is φ = 14103360.

The previous prime is 21202003. The next prime is 21202033. The reversal of 21202011 is 11020212.

It is not a de Polignac number, because 21202011 - 2³ = 21202003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21201984 and 21202002.

It is not an unprimeable number, because it can be changed into a prime (21202001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2131 + ... + 6851.

It is an arithmetic number, because the mean of its divisors is an integer number (2557750).

Almost surely, 2^21202011 is an apocalyptic number.

21202011 is a deficient number, since it is larger than the sum of its proper divisors (9490989).

21202011 is a wasteful number, since it uses less digits than its factorization.

21202011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5226 (or 5223 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 21202011 is about 4604.5641487550. The cubic root of 21202011 is about 276.7742516381.

Adding to 21202011 its reverse (11020212), we get a palindrome (32222223).

The spelling of 21202011 in words is "twenty-one million, two hundred two thousand, eleven".