12120211211021 has 4 divisors (see below), whose sum is σ = 12647176915872. Its totient is φ = 11593245506172.

The previous prime is 12120211210981. The next prime is 12120211211081. The reversal of 12120211211021 is 12011211202121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12120211211021 - 2²² = 12120207016717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120211211081) 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, 263482852391 + ... + 263482852436.

It is an arithmetic number, because the mean of its divisors is an integer number (3161794228968).

Almost surely, 2^{12120211211021} is an apocalyptic number.

It is an amenable number.

12120211211021 is a deficient number, since it is larger than the sum of its proper divisors (526965704851).

12120211211021 is an equidigital number, since it uses as much as digits as its factorization.

12120211211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526965704850.

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

Adding to 12120211211021 its reverse (12011211202121), we get a palindrome (24131422413142).

The spelling of 12120211211021 in words is "twelve trillion, one hundred twenty billion, two hundred eleven million, two hundred eleven thousand, twenty-one".