7857221507142 has 64 divisors (see below), whose sum is σ = 18016571473920. Its totient is φ = 2237779853856.

The previous prime is 7857221507119. The next prime is 7857221507143. The reversal of 7857221507142 is 2417051227587.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7857221507143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17926159 + ... + 18359237.

It is an arithmetic number, because the mean of its divisors is an integer number (281508929280).

Almost surely, 2^{7857221507142} is an apocalyptic number.

7857221507142 is an abundant number, since it is smaller than the sum of its proper divisors (10159349966778).

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

7857221507142 is a wasteful number, since it uses less digits than its factorization.

7857221507142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434465.

The product of its (nonzero) digits is 2195200, while the sum is 51.

The spelling of 7857221507142 in words is "seven trillion, eight hundred fifty-seven billion, two hundred twenty-one million, five hundred seven thousand, one hundred forty-two".