642021546222 has 64 divisors (see below), whose sum is σ = 1631578291200. Its totient is φ = 183316897440.

The previous prime is 642021546211. The next prime is 642021546251. The reversal of 642021546222 is 222645120246.

642021546222 is a `hidden beast` number, since 6 + 4 + 2 + 0 + 21 + 5 + 4 + 622 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44572 + ... + 1134032.

It is an arithmetic number, because the mean of its divisors is an integer number (25493410800).

Almost surely, 2^642021546222 is an apocalyptic number.

642021546222 is an abundant number, since it is smaller than the sum of its proper divisors (989556744978).

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

642021546222 is a wasteful number, since it uses less digits than its factorization.

642021546222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091038 (or 1091032 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

Adding to 642021546222 its reverse (222645120246), we get a palindrome (864666666468).

The spelling of 642021546222 in words is "six hundred forty-two billion, twenty-one million, five hundred forty-six thousand, two hundred twenty-two".