21012120201011 has 2 divisors, whose sum is σ = 21012120201012. Its totient is φ = 21012120201010.

The previous prime is 21012120201001. The next prime is 21012120201031. The reversal of 21012120201011 is 11010202121012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012120201011 - 2⁶ = 21012120200947 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012120201001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506060100505 + 10506060100506.

It is an arithmetic number, because the mean of its divisors is an integer number (10506060100506).

Almost surely, 2^{21012120201011} is an apocalyptic number.

21012120201011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012120201011 is an equidigital number, since it uses as much as digits as its factorization.

21012120201011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21012120201011 its reverse (11010202121012), we get a palindrome (32022322322023).

The spelling of 21012120201011 in words is "twenty-one trillion, twelve billion, one hundred twenty million, two hundred one thousand, eleven".