555121421040 has 80 divisors (see below), whose sum is σ = 1721261582208. Its totient is φ = 147999245568.

The previous prime is 555121421039. The next prime is 555121421047. The reversal of 555121421040 is 40124121555.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 555121420989 and 555121421007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555121421047) 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 15 ways as a sum of consecutive naturals, for example, 825079 + ... + 1338281.

Almost surely, 2^555121421040 is an apocalyptic number.

It is an amenable number.

555121421040 is an abundant number, since it is smaller than the sum of its proper divisors (1166140161168).

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

555121421040 is a wasteful number, since it uses less digits than its factorization.

555121421040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517726 (or 517720 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 555121421040 its reverse (40124121555), we get a palindrome (595245542595).

The spelling of 555121421040 in words is "five hundred fifty-five billion, one hundred twenty-one million, four hundred twenty-one thousand, forty".