1221201112 has 8 divisors (see below), whose sum is σ = 2289752100. Its totient is φ = 610600552.

The previous prime is 1221201101. The next prime is 1221201119. The reversal of 1221201112 is 2111021221.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1221201092 and 1221201101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221201119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76325062 + ... + 76325077.

Almost surely, 2^1221201112 is an apocalyptic number.

It is an amenable number.

1221201112 is a deficient number, since it is larger than the sum of its proper divisors (1068550988).

1221201112 is a wasteful number, since it uses less digits than its factorization.

1221201112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152650145 (or 152650141 counting only the distinct ones).

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

The square root of 1221201112 is about 34945.6880315727. The cubic root of 1221201112 is about 1068.8802773966.

Adding to 1221201112 its reverse (2111021221), we get a palindrome (3332222333).

The spelling of 1221201112 in words is "one billion, two hundred twenty-one million, two hundred one thousand, one hundred twelve".