12021012211 has 4 divisors (see below), whose sum is σ = 12945705472. Its totient is φ = 11096318952.

The previous prime is 12021012193. The next prime is 12021012253. The reversal of 12021012211 is 11221012021.

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 12021012211 - 2¹¹ = 12021010163 is a prime.

It is a super-2 number, since 2×12021012211² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 924693247 = 12021012211 / (1 + 2 + 0 + 2 + 1 + 0 + 1 + 2 + 2 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021012191 and 12021012200.

It is not an unprimeable number, because it can be changed into a prime (12021019211) 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, 462346611 + ... + 462346636.

It is an arithmetic number, because the mean of its divisors is an integer number (3236426368).

Almost surely, 2^12021012211 is an apocalyptic number.

12021012211 is a deficient number, since it is larger than the sum of its proper divisors (924693261).

12021012211 is an equidigital number, since it uses as much as digits as its factorization.

12021012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924693260.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12021012211 its reverse (11221012021), we get a palindrome (23242024232).

The spelling of 12021012211 in words is "twelve billion, twenty-one million, twelve thousand, two hundred eleven".