1212223421402 has 12 divisors (see below), whose sum is σ = 2115206174250. Its totient is φ = 519524323416.

The previous prime is 1212223421369. The next prime is 1212223421407. The reversal of 1212223421402 is 2041243222121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 898364648041 + 313858773361 = 947821^2 + 560231^2 .

It is not an unprimeable number, because it can be changed into a prime (1212223421407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6184813277 + ... + 6184813472.

Almost surely, 2^{1212223421402} is an apocalyptic number.

1212223421402 is a deficient number, since it is larger than the sum of its proper divisors (902982752848).

1212223421402 is a wasteful number, since it uses less digits than its factorization.

1212223421402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12369626765 (or 12369626758 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 1212223421402 its reverse (2041243222121), we get a palindrome (3253466643523).

The spelling of 1212223421402 in words is "one trillion, two hundred twelve billion, two hundred twenty-three million, four hundred twenty-one thousand, four hundred two".