121311013635 has 80 divisors (see below), whose sum is σ = 249068901312. Its totient is φ = 55335571200.

The previous prime is 121311013589. The next prime is 121311013639. The reversal of 121311013635 is 536310113121.

It is a happy number.

121311013635 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 1 + 10 + 13 + 635 = 666.

It is not a de Polignac number, because 121311013635 - 2⁹ = 121311013123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 121311013599 and 121311013608.

It is not an unprimeable number, because it can be changed into a prime (121311013639) 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 79 ways as a sum of consecutive naturals, for example, 1260525 + ... + 1353345.

Almost surely, 2^121311013635 is an apocalyptic number.

121311013635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121311013635 is an abundant number, since it is smaller than the sum of its proper divisors (127757887677).

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

121311013635 is an equidigital number, since it uses as much as digits as its factorization.

121311013635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93306 (or 93297 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

Adding to 121311013635 its reverse (536310113121), we get a palindrome (657621126756).

The spelling of 121311013635 in words is "one hundred twenty-one billion, three hundred eleven million, thirteen thousand, six hundred thirty-five".