21122021222011 has 4 divisors (see below), whose sum is σ = 21122051498352. Its totient is φ = 21121990945672.

The previous prime is 21122021221943. The next prime is 21122021222017. The reversal of 21122021222011 is 11022212022112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122021222011 is a prime.

It is a super-2 number, since 2×21122021222011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21122021222011.

It is not an unprimeable number, because it can be changed into a prime (21122021222017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14066416 + ... + 15495421.

It is an arithmetic number, because the mean of its divisors is an integer number (5280512874588).

Almost surely, 2^{21122021222011} is an apocalyptic number.

21122021222011 is a deficient number, since it is larger than the sum of its proper divisors (30276341).

21122021222011 is an equidigital number, since it uses as much as digits as its factorization.

21122021222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30276340.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21122021222011 its reverse (11022212022112), we get a palindrome (32144233244123).

The spelling of 21122021222011 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-one million, two hundred twenty-two thousand, eleven".