21220002011 has 16 divisors (see below), whose sum is σ = 23108956416. Its totient is φ = 19368287136.

The previous prime is 21220001969. The next prime is 21220002019. The reversal of 21220002011 is 11020002212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21220002011 - 2¹⁸ = 21219739867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21220001983 and 21220002001.

It is not an unprimeable number, because it can be changed into a prime (21220002019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 902936 + ... + 926138.

It is an arithmetic number, because the mean of its divisors is an integer number (1444309776).

Almost surely, 2^21220002011 is an apocalyptic number.

21220002011 is a deficient number, since it is larger than the sum of its proper divisors (1888954405).

21220002011 is a wasteful number, since it uses less digits than its factorization.

21220002011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24002.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21220002011 its reverse (11020002212), we get a palindrome (32240004223).

The spelling of 21220002011 in words is "twenty-one billion, two hundred twenty million, two thousand, eleven".