21130122001211 has 4 divisors (see below), whose sum is σ = 21130152822000. Its totient is φ = 21130091180424.

The previous prime is 21130122001129. The next prime is 21130122001231. The reversal of 21130122001211 is 11210022103112.

It is a happy number.

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 21130122001211 - 2¹⁰ = 21130122000187 is a prime.

It is a super-2 number, since 2×21130122001211² (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 21130122001211.

It is not an unprimeable number, because it can be changed into a prime (21130122001231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14358071 + ... + 15761168.

It is an arithmetic number, because the mean of its divisors is an integer number (5282538205500).

Almost surely, 2^{21130122001211} is an apocalyptic number.

21130122001211 is a deficient number, since it is larger than the sum of its proper divisors (30820789).

21130122001211 is an equidigital number, since it uses as much as digits as its factorization.

21130122001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30820788.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21130122001211 its reverse (11210022103112), we get a palindrome (32340144104323).

The spelling of 21130122001211 in words is "twenty-one trillion, one hundred thirty billion, one hundred twenty-two million, one thousand, two hundred eleven".