1321212212 has 6 divisors (see below), whose sum is σ = 2312121378. Its totient is φ = 660606104.

The previous prime is 1321212203. The next prime is 1321212293. The reversal of 1321212212 is 2122121231.

It can be written as a sum of positive squares in only one way, i.e., 1180884496 + 140327716 = 34364^2 + 11846^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165151523 + ... + 165151530.

It is an arithmetic number, because the mean of its divisors is an integer number (385353563).

Almost surely, 2^1321212212 is an apocalyptic number.

It is an amenable number.

1321212212 is a deficient number, since it is larger than the sum of its proper divisors (990909166).

1321212212 is a wasteful number, since it uses less digits than its factorization.

1321212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330303057 (or 330303055 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 1321212212 is about 36348.4829394570. The cubic root of 1321212212 is about 1097.2970031169.

Adding to 1321212212 its reverse (2122121231), we get a palindrome (3443333443).

The spelling of 1321212212 in words is "one billion, three hundred twenty-one million, two hundred twelve thousand, two hundred twelve".