1220342121 has 12 divisors (see below), whose sum is σ = 1763073520. Its totient is φ = 813396600.

The previous prime is 1220342099. The next prime is 1220342147. The reversal of 1220342121 is 1212430221.

It is a happy number.

1220342121 is a `hidden beast` number, since 1 + 220 + 3 + 421 + 21 = 666.

1220342121 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1220342121 - 2⁹ = 1220341609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220342094 and 1220342103.

It is not an unprimeable number, because it can be changed into a prime (1220349121) 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, 47550 + ... + 68568.

Almost surely, 2^1220342121 is an apocalyptic number.

It is an amenable number.

1220342121 is a deficient number, since it is larger than the sum of its proper divisors (542731399).

1220342121 is a wasteful number, since it uses less digits than its factorization.

1220342121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27476 (or 27473 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1220342121 is about 34933.3954977182. The cubic root of 1220342121 is about 1068.6296023602.

Adding to 1220342121 its reverse (1212430221), we get a palindrome (2432772342).

The spelling of 1220342121 in words is "one billion, two hundred twenty million, three hundred forty-two thousand, one hundred twenty-one".