12021013211 has 4 divisors (see below), whose sum is σ = 12049703400. Its totient is φ = 11992323024.

The previous prime is 12021013201. The next prime is 12021013217. The reversal of 12021013211 is 11231012021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11231012021 = 23623 ⋅475427.

It is a de Polignac number, because none of the positive numbers 2^k-12021013211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021013217) 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, 14344466 + ... + 14345303.

It is an arithmetic number, because the mean of its divisors is an integer number (3012425850).

Almost surely, 2^12021013211 is an apocalyptic number.

12021013211 is a deficient number, since it is larger than the sum of its proper divisors (28690189).

12021013211 is an equidigital number, since it uses as much as digits as its factorization.

12021013211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28690188.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 12021013211 its reverse (11231012021), we get a palindrome (23252025232).

The spelling of 12021013211 in words is "twelve billion, twenty-one million, thirteen thousand, two hundred eleven".