121635319442 has 288 divisors, whose sum is σ = 257233466880. Its totient is φ = 42796615680.

The previous prime is 121635319363. The next prime is 121635319457. The reversal of 121635319442 is 244913536121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121635319442.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 360935498 + ... + 360935834.

It is an arithmetic number, because the mean of its divisors is an integer number (893171760).

Almost surely, 2^121635319442 is an apocalyptic number.

121635319442 is an abundant number, since it is smaller than the sum of its proper divisors (135598147438).

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

121635319442 is a wasteful number, since it uses less digits than its factorization.

121635319442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 446 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The spelling of 121635319442 in words is "one hundred twenty-one billion, six hundred thirty-five million, three hundred nineteen thousand, four hundred forty-two".