21020120001011 has 2 divisors, whose sum is σ = 21020120001012. Its totient is φ = 21020120001010.

The previous prime is 21020120001007. The next prime is 21020120001043. The reversal of 21020120001011 is 11010002102012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020120001011 - 2² = 21020120001007 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020120000983 and 21020120001001.

It is not a weakly prime, because it can be changed into another prime (21020120051011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510060000505 + 10510060000506.

It is an arithmetic number, because the mean of its divisors is an integer number (10510060000506).

Almost surely, 2^{21020120001011} is an apocalyptic number.

21020120001011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020120001011 is an equidigital number, since it uses as much as digits as its factorization.

21020120001011 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21020120001011 its reverse (11010002102012), we get a palindrome (32030122103023).

The spelling of 21020120001011 in words is "twenty-one trillion, twenty billion, one hundred twenty million, one thousand, eleven".