12120011210021 has 24 divisors (see below), whose sum is σ = 14581957679352. Its totient is φ = 10003906915200.

The previous prime is 12120011210009. The next prime is 12120011210057. The reversal of 12120011210021 is 12001211002121.

It can be written as a sum of positive squares in 4 ways, for example, as 29863296100 + 12090147913921 = 172810^2 + 3477089^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12120011210021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12120011209978 and 12120011210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120011212021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63060026 + ... + 63251931.

It is an arithmetic number, because the mean of its divisors is an integer number (607581569973).

Almost surely, 2^{12120011210021} is an apocalyptic number.

12120011210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12120011210021 is a deficient number, since it is larger than the sum of its proper divisors (2461946469331).

12120011210021 is a wasteful number, since it uses less digits than its factorization.

12120011210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126312053 (or 126312042 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12120011210021 its reverse (12001211002121), we get a palindrome (24121222212142).

The spelling of 12120011210021 in words is "twelve trillion, one hundred twenty billion, eleven million, two hundred ten thousand, twenty-one".