121551000520 has 32 divisors (see below), whose sum is σ = 287883950400. Its totient is φ = 46061431488.

The previous prime is 121551000517. The next prime is 121551000559. The reversal of 121551000520 is 25000155121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121551000491 and 121551000500.

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, 79967004 + ... + 79968523.

It is an arithmetic number, because the mean of its divisors is an integer number (8996373450).

Almost surely, 2^121551000520 is an apocalyptic number.

121551000520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121551000520 is an abundant number, since it is smaller than the sum of its proper divisors (166332949880).

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

121551000520 is a wasteful number, since it uses less digits than its factorization.

121551000520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159935557 (or 159935553 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

Adding to 121551000520 its reverse (25000155121), we get a palindrome (146551155641).

The spelling of 121551000520 in words is "one hundred twenty-one billion, five hundred fifty-one million, five hundred twenty", and thus it is an aban number.