642121014450 has 48 divisors (see below), whose sum is σ = 1614889158336. Its totient is φ = 168820545600.

The previous prime is 642121014449. The next prime is 642121014461. The reversal of 642121014450 is 54410121246.

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

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 30135877 + ... + 30157176.

It is an arithmetic number, because the mean of its divisors is an integer number (33643524132).

Almost surely, 2^642121014450 is an apocalyptic number.

642121014450 is an abundant number, since it is smaller than the sum of its proper divisors (972768143886).

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

642121014450 is a wasteful number, since it uses less digits than its factorization.

642121014450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60293139 (or 60293134 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 642121014450 its reverse (54410121246), we get a palindrome (696531135696).

The spelling of 642121014450 in words is "six hundred forty-two billion, one hundred twenty-one million, fourteen thousand, four hundred fifty".