21120102011 has 2 divisors, whose sum is σ = 21120102012. Its totient is φ = 21120102010.

The previous prime is 21120101987. The next prime is 21120102037. The reversal of 21120102011 is 11020102112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120102011 - 2¹⁰ = 21120100987 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120101983 and 21120102001.

It is not a weakly prime, because it can be changed into another prime (21120102071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560051005 + 10560051006.

It is an arithmetic number, because the mean of its divisors is an integer number (10560051006).

Almost surely, 2^21120102011 is an apocalyptic number.

21120102011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120102011 is an equidigital number, since it uses as much as digits as its factorization.

21120102011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21120102011 its reverse (11020102112), we get a palindrome (32140204123).

The spelling of 21120102011 in words is "twenty-one billion, one hundred twenty million, one hundred two thousand, eleven".