121212423402 has 48 divisors (see below), whose sum is σ = 286940177472. Its totient is φ = 33437900160.

The previous prime is 121212423383. The next prime is 121212423403. The reversal of 121212423402 is 204324212121.

It is not an unprimeable number, because it can be changed into a prime (121212423403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1680499 + ... + 1751142.

It is an arithmetic number, because the mean of its divisors is an integer number (5977920364).

Almost surely, 2^121212423402 is an apocalyptic number.

121212423402 is an abundant number, since it is smaller than the sum of its proper divisors (165727754070).

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

121212423402 is a wasteful number, since it uses less digits than its factorization.

121212423402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3431711 (or 3431682 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 121212423402 its reverse (204324212121), we get a palindrome (325536635523).

The spelling of 121212423402 in words is "one hundred twenty-one billion, two hundred twelve million, four hundred twenty-three thousand, four hundred two".