21000222011 has 4 divisors (see below), whose sum is σ = 21007971024. Its totient is φ = 20992473000.

The previous prime is 21000222007. The next prime is 21000222071. The reversal of 21000222011 is 11022200012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21000222011 - 2² = 21000222007 is a prime.

It is a super-2 number, since 2×21000222011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000221983 and 21000222001.

It is not an unprimeable number, because it can be changed into a prime (21000222071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3870440 + ... + 3875861.

It is an arithmetic number, because the mean of its divisors is an integer number (5251992756).

Almost surely, 2^21000222011 is an apocalyptic number.

21000222011 is a deficient number, since it is larger than the sum of its proper divisors (7749013).

21000222011 is an equidigital number, since it uses as much as digits as its factorization.

21000222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7749012.

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

Adding to 21000222011 its reverse (11022200012), we get a palindrome (32022422023).

The spelling of 21000222011 in words is "twenty-one billion, two hundred twenty-two thousand, eleven".