21013011211 has 16 divisors (see below), whose sum is σ = 22675921920. Its totient is φ = 19400008320.

The previous prime is 21013011199. The next prime is 21013011233. The reversal of 21013011211 is 11211031012.

It is a happy number.

It is not a de Polignac number, because 21013011211 - 2⁷ = 21013011083 is a prime.

It is a super-2 number, since 2×21013011211² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21013011191 and 21013011200.

It is not an unprimeable number, because it can be changed into a prime (21013011611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233626 + ... + 310816.

It is an arithmetic number, because the mean of its divisors is an integer number (1417245120).

Almost surely, 2^21013011211 is an apocalyptic number.

21013011211 is a deficient number, since it is larger than the sum of its proper divisors (1662910709).

21013011211 is a wasteful number, since it uses less digits than its factorization.

21013011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77514.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21013011211 its reverse (11211031012), we get a palindrome (32224042223).

The spelling of 21013011211 in words is "twenty-one billion, thirteen million, eleven thousand, two hundred eleven".