1220012121 has 4 divisors (see below), whose sum is σ = 1626682832. Its totient is φ = 813341412.

The previous prime is 1220012119. The next prime is 1220012147. The reversal of 1220012121 is 1212100221.

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 not a de Polignac number, because 1220012121 - 2¹ = 1220012119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220012097 and 1220012106.

It is not an unprimeable number, because it can be changed into a prime (1220012221) 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, 203335351 + ... + 203335356.

It is an arithmetic number, because the mean of its divisors is an integer number (406670708).

Almost surely, 2^1220012121 is an apocalyptic number.

It is an amenable number.

1220012121 is a deficient number, since it is larger than the sum of its proper divisors (406670711).

1220012121 is an equidigital number, since it uses as much as digits as its factorization.

1220012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406670710.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1220012121 is about 34928.6719043252. The cubic root of 1220012121 is about 1068.5332688390.

Adding to 1220012121 its reverse (1212100221), we get a palindrome (2432112342).

The spelling of 1220012121 in words is "one billion, two hundred twenty million, twelve thousand, one hundred twenty-one".