1211220112 has 20 divisors (see below), whose sum is σ = 2448771840. Its totient is φ = 579279008.

The previous prime is 1211220107. The next prime is 1211220121. The reversal of 1211220112 is 2110221121.

It is a junction number, because it is equal to n+sod(n) for n = 1211220092 and 1211220101.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1645312 + ... + 1646047.

It is an arithmetic number, because the mean of its divisors is an integer number (122438592).

Almost surely, 2^1211220112 is an apocalyptic number.

It is an amenable number.

1211220112 is an abundant number, since it is smaller than the sum of its proper divisors (1237551728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211220112 is a wasteful number, since it uses less digits than its factorization.

1211220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3291390 (or 3291384 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1211220112 is about 34802.5877198808. The cubic root of 1211220112 is about 1065.9602856136.

Adding to 1211220112 its reverse (2110221121), we get a palindrome (3321441233).

The spelling of 1211220112 in words is "one billion, two hundred eleven million, two hundred twenty thousand, one hundred twelve".