21030120111211 has 8 divisors (see below), whose sum is σ = 21756981031200. Its totient is φ = 20303371482240.

The previous prime is 21030120111197. The next prime is 21030120111227. The reversal of 21030120111211 is 11211102103012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21030120111211 - 2⁵ = 21030120111179 is a prime.

It is a super-2 number, since 2×21030120111211² (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 (21030120118211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27691630 + ... + 28440931.

It is an arithmetic number, because the mean of its divisors is an integer number (2719622628900).

Almost surely, 2^{21030120111211} is an apocalyptic number.

21030120111211 is a deficient number, since it is larger than the sum of its proper divisors (726860919989).

21030120111211 is a wasteful number, since it uses less digits than its factorization.

21030120111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56145509.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21030120111211 its reverse (11211102103012), we get a palindrome (32241222214223).

The spelling of 21030120111211 in words is "twenty-one trillion, thirty billion, one hundred twenty million, one hundred eleven thousand, two hundred eleven".