21201022212011 has 2 divisors, whose sum is σ = 21201022212012. Its totient is φ = 21201022212010.

The previous prime is 21201022211969. The next prime is 21201022212031. The reversal of 21201022212011 is 11021222010212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21201022212011 - 2¹⁴ = 21201022195627 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201022212031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600511106005 + 10600511106006.

It is an arithmetic number, because the mean of its divisors is an integer number (10600511106006).

Almost surely, 2^{21201022212011} is an apocalyptic number.

21201022212011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201022212011 is an equidigital number, since it uses as much as digits as its factorization.

21201022212011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21201022212011 its reverse (11021222010212), we get a palindrome (32222244222223).

The spelling of 21201022212011 in words is "twenty-one trillion, two hundred one billion, twenty-two million, two hundred twelve thousand, eleven".