21002020112011 has 2 divisors, whose sum is σ = 21002020112012. Its totient is φ = 21002020112010.

The previous prime is 21002020111967. The next prime is 21002020112113. The reversal of 21002020112011 is 11021102020012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21002020112011 - 2¹⁹ = 21002019587723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002020111982 and 21002020112000.

It is not a weakly prime, because it can be changed into another prime (21002020112611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501010056005 + 10501010056006.

It is an arithmetic number, because the mean of its divisors is an integer number (10501010056006).

Almost surely, 2^{21002020112011} is an apocalyptic number.

21002020112011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002020112011 is an equidigital number, since it uses as much as digits as its factorization.

21002020112011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21002020112011 its reverse (11021102020012), we get a palindrome (32023122132023).

The spelling of 21002020112011 in words is "twenty-one trillion, two billion, twenty million, one hundred twelve thousand, eleven".