1230121212 has 12 divisors (see below), whose sum is σ = 2870282856. Its totient is φ = 410040400.

The previous prime is 1230121201. The next prime is 1230121229. The reversal of 1230121212 is 2121210321.

It is a tau number, because it is divible by the number of its divisors (12).

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1230121191 and 1230121200.

It is a congruent number.

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, 51255039 + ... + 51255062.

It is an arithmetic number, because the mean of its divisors is an integer number (239190238).

Almost surely, 2^1230121212 is an apocalyptic number.

1230121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1230121212 is an abundant number, since it is smaller than the sum of its proper divisors (1640161644).

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

1230121212 is a wasteful number, since it uses less digits than its factorization.

1230121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102510108 (or 102510106 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1230121212 is about 35073.0838678323. The cubic root of 1230121212 is about 1071.4764640738.

Adding to 1230121212 its reverse (2121210321), we get a palindrome (3351331533).

The spelling of 1230121212 in words is "one billion, two hundred thirty million, one hundred twenty-one thousand, two hundred twelve".