120111021121221 has 48 divisors (see below), whose sum is σ = 193003640363520. Its totient is φ = 73791487036800.

The previous prime is 120111021121211. The next prime is 120111021121253. The reversal of 120111021121221 is 122121120111021.

It is a happy number.

120111021121221 is a `hidden beast` number, since 1 + 201 + 1 + 10 + 211 + 21 + 221 = 666.

It is not a de Polignac number, because 120111021121221 - 2¹⁹ = 120111020596933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 120111021121194 and 120111021121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120111021121211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19156821 + ... + 24641546.

It is an arithmetic number, because the mean of its divisors is an integer number (4020909174240).

Almost surely, 2^{120111021121221} is an apocalyptic number.

It is an amenable number.

120111021121221 is a deficient number, since it is larger than the sum of its proper divisors (72892619242299).

120111021121221 is a wasteful number, since it uses less digits than its factorization.

120111021121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43799003 (or 43798984 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 120111021121221 its reverse (122121120111021), we get a palindrome (242232141232242).

The spelling of 120111021121221 in words is "one hundred twenty trillion, one hundred eleven billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".