1221012112 has 20 divisors (see below), whose sum is σ = 2404495036. Its totient is φ = 600497280.

The previous prime is 1221012083. The next prime is 1221012119. The reversal of 1221012112 is 2112101221.

It can be written as a sum of positive squares in 2 ways, for example, as 337971456 + 883040656 = 18384^2 + 29716^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221012092 and 1221012101.

It is not an unprimeable number, because it can be changed into a prime (1221012119) 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, 624543 + ... + 626494.

Almost surely, 2^1221012112 is an apocalyptic number.

It is an amenable number.

1221012112 is a deficient number, since it is larger than the sum of its proper divisors (1183482924).

1221012112 is a wasteful number, since it uses less digits than its factorization.

1221012112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251106 (or 1251100 counting only the distinct ones).

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

The square root of 1221012112 is about 34942.9837306433. The cubic root of 1221012112 is about 1068.8251325634.

Adding to 1221012112 its reverse (2112101221), we get a palindrome (3333113333).

The spelling of 1221012112 in words is "one billion, two hundred twenty-one million, twelve thousand, one hundred twelve".