21122012221211 has 16 divisors (see below), whose sum is σ = 23096790003168. Its totient is φ = 19156348780800.

The previous prime is 21122012221147. The next prime is 21122012221313. The reversal of 21122012221211 is 11212221022112.

It is not a de Polignac number, because 21122012221211 - 2⁶ = 21122012221147 is a prime.

It is a super-2 number, since 2×21122012221211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122012221711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27638501 + ... + 28392441.

It is an arithmetic number, because the mean of its divisors is an integer number (1443549375198).

Almost surely, 2^{21122012221211} is an apocalyptic number.

21122012221211 is a deficient number, since it is larger than the sum of its proper divisors (1974777781957).

21122012221211 is a wasteful number, since it uses less digits than its factorization.

21122012221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759982.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21122012221211 its reverse (11212221022112), we get a palindrome (32334233243323).

The spelling of 21122012221211 in words is "twenty-one trillion, one hundred twenty-two billion, twelve million, two hundred twenty-one thousand, two hundred eleven".