121335320520 has 160 divisors (see below), whose sum is σ = 417306193920. Its totient is φ = 31603582080.

The previous prime is 121335320497. The next prime is 121335320527. The reversal of 121335320520 is 25023533121.

It is a happy number.

121335320520 is a `hidden beast` number, since 1 + 2 + 1 + 335 + 320 + 5 + 2 + 0 = 666.

It is a super-2 number, since 2×121335320520² (a number of 23 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (121335320527) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 296136 + ... + 574775.

It is an arithmetic number, because the mean of its divisors is an integer number (2608163712).

Almost surely, 2^121335320520 is an apocalyptic number.

121335320520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121335320520 is an abundant number, since it is smaller than the sum of its proper divisors (295970873400).

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

121335320520 is a wasteful number, since it uses less digits than its factorization.

121335320520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870977 (or 870964 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 121335320520 its reverse (25023533121), we get a palindrome (146358853641).

The spelling of 121335320520 in words is "one hundred twenty-one billion, three hundred thirty-five million, three hundred twenty thousand, five hundred twenty".