21122101201211 has 4 divisors (see below), whose sum is σ = 21133764428424. Its totient is φ = 21110437974000.

The previous prime is 21122101201181. The next prime is 21122101201217. The reversal of 21122101201211 is 11210210122112.

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 21122101201211 - 2¹⁴ = 21122101184827 is a prime.

It is a super-2 number, since 2×21122101201211² (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 21122101201211.

It is not an unprimeable number, because it can be changed into a prime (21122101201217) 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, 5831610890 + ... + 5831614511.

It is an arithmetic number, because the mean of its divisors is an integer number (5283441107106).

Almost surely, 2^{21122101201211} is an apocalyptic number.

21122101201211 is a deficient number, since it is larger than the sum of its proper divisors (11663227213).

21122101201211 is a wasteful number, since it uses less digits than its factorization.

21122101201211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11663227212.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21122101201211 its reverse (11210210122112), we get a palindrome (32332311323323).

The spelling of 21122101201211 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred one million, two hundred one thousand, two hundred eleven".