7142313821 has 4 divisors (see below), whose sum is σ = 7205520252. Its totient is φ = 7079107392.

The previous prime is 7142313811. The next prime is 7142313863. The reversal of 7142313821 is 1283132417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1283132417 = 7 ⋅183304631.

It can be written as a sum of positive squares in 2 ways, for example, as 1383021721 + 5759292100 = 37189^2 + 75890^2 .

It is a cyclic number.

It is not a de Polignac number, because 7142313821 - 2²⁶ = 7075204957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7142313811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31603046 + ... + 31603271.

It is an arithmetic number, because the mean of its divisors is an integer number (1801380063).

Almost surely, 2^7142313821 is an apocalyptic number.

It is an amenable number.

7142313821 is a deficient number, since it is larger than the sum of its proper divisors (63206431).

7142313821 is a wasteful number, since it uses less digits than its factorization.

7142313821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63206430.

The product of its digits is 8064, while the sum is 32.

The square root of 7142313821 is about 84512.2110762699. The cubic root of 7142313821 is about 1925.8079541787.

The spelling of 7142313821 in words is "seven billion, one hundred forty-two million, three hundred thirteen thousand, eight hundred twenty-one".