21122011011211 has 4 divisors (see below), whose sum is σ = 23042193830424. Its totient is φ = 19201828192000.

The previous prime is 21122011011209. The next prime is 21122011011217. The reversal of 21122011011211 is 11211011022112.

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

It is a cyclic number.

It is not a de Polignac number, because 21122011011211 - 2¹ = 21122011011209 is a prime.

It is a super-2 number, since 2×21122011011211² (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 (21122011011217) 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, 960091409590 + ... + 960091409611.

It is an arithmetic number, because the mean of its divisors is an integer number (5760548457606).

Almost surely, 2^{21122011011211} is an apocalyptic number.

21122011011211 is a deficient number, since it is larger than the sum of its proper divisors (1920182819213).

21122011011211 is a wasteful number, since it uses less digits than its factorization.

21122011011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920182819212.

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

Adding to 21122011011211 its reverse (11211011022112), we get a palindrome (32333022033323).

The spelling of 21122011011211 in words is "twenty-one trillion, one hundred twenty-two billion, eleven million, eleven thousand, two hundred eleven".