121315136020 has 48 divisors (see below), whose sum is σ = 281773972368. Its totient is φ = 43582648320.

The previous prime is 121315136009. The next prime is 121315136023. The reversal of 121315136020 is 20631513121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 187470864 + 121127665156 = 13692^2 + 348034^2 .

It is a super-2 number, since 2×121315136020² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121315136023) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6295741 + ... + 6314980.

It is an arithmetic number, because the mean of its divisors is an integer number (5870291091).

Almost surely, 2^121315136020 is an apocalyptic number.

121315136020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121315136020 is an abundant number, since it is smaller than the sum of its proper divisors (160458836348).

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

121315136020 is a wasteful number, since it uses less digits than its factorization.

121315136020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12610780 (or 12610778 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 121315136020 its reverse (20631513121), we get a palindrome (141946649141).

The spelling of 121315136020 in words is "one hundred twenty-one billion, three hundred fifteen million, one hundred thirty-six thousand, twenty".