121493402538 has 64 divisors (see below), whose sum is σ = 255556933632. Its totient is φ = 38456873280.

The previous prime is 121493402507. The next prime is 121493402557. The reversal of 121493402538 is 835204394121.

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 121493402538.

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 31 ways as a sum of consecutive naturals, for example, 14419795 + ... + 14428217.

It is an arithmetic number, because the mean of its divisors is an integer number (3993077088).

Almost surely, 2^121493402538 is an apocalyptic number.

121493402538 is an abundant number, since it is smaller than the sum of its proper divisors (134063531094).

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

121493402538 is a wasteful number, since it uses less digits than its factorization.

121493402538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10019.

The product of its (nonzero) digits is 207360, while the sum is 42.

Adding to 121493402538 its reverse (835204394121), we get a palindrome (956697796659).

The spelling of 121493402538 in words is "one hundred twenty-one billion, four hundred ninety-three million, four hundred two thousand, five hundred thirty-eight".