120012111222221 has 12 divisors (see below), whose sum is σ = 125457431886108. Its totient is φ = 114793702176384.

The previous prime is 120012111222209. The next prime is 120012111222229. The reversal of 120012111222221 is 122222111210021.

It can be written as a sum of positive squares in 2 ways, for example, as 11631414756196 + 108380696466025 = 3410486^2 + 10410605^2 .

It is a de Polignac number, because none of the positive numbers 2^k-120012111222221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120012111222193 and 120012111222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120012111222229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207138491 + ... + 207717063.

It is an arithmetic number, because the mean of its divisors is an integer number (10454785990509).

Almost surely, 2^{120012111222221} is an apocalyptic number.

It is an amenable number.

120012111222221 is a deficient number, since it is larger than the sum of its proper divisors (5445320663887).

120012111222221 is an equidigital number, since it uses as much as digits as its factorization.

120012111222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970732 (or 970709 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 120012111222221 its reverse (122222111210021), we get a palindrome (242234222432242).

The spelling of 120012111222221 in words is "one hundred twenty trillion, twelve billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty-one".