121540412020 has 24 divisors (see below), whose sum is σ = 266332034304. Its totient is φ = 46502418336.

The previous prime is 121540411973. The next prime is 121540412033. The reversal of 121540412020 is 20214045121.

It is a junction number, because it is equal to n+sod(n) for n = 121540411982 and 121540412000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132108684 + ... + 132109603.

It is an arithmetic number, because the mean of its divisors is an integer number (11097168096).

Almost surely, 2^121540412020 is an apocalyptic number.

121540412020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121540412020 is an abundant number, since it is smaller than the sum of its proper divisors (144791622284).

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

121540412020 is a wasteful number, since it uses less digits than its factorization.

121540412020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264218319 (or 264218317 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 121540412020 its reverse (20214045121), we get a palindrome (141754457141).

The spelling of 121540412020 in words is "one hundred twenty-one billion, five hundred forty million, four hundred twelve thousand, twenty".