102323273821 has 4 divisors (see below), whose sum is σ = 103336375644. Its totient is φ = 101310172000.

The previous prime is 102323273813. The next prime is 102323273827. The reversal of 102323273821 is 128372323201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128372323201 = 101 ⋅1271013101.

It can be written as a sum of positive squares in 2 ways, for example, as 54821071321 + 47502202500 = 234139^2 + 217950^2 .

It is a cyclic number.

It is not a de Polignac number, because 102323273821 - 2³ = 102323273813 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 (102323273827) 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 3 ways as a sum of consecutive naturals, for example, 506550760 + ... + 506550961.

It is an arithmetic number, because the mean of its divisors is an integer number (25834093911).

Almost surely, 2^102323273821 is an apocalyptic number.

It is an amenable number.

102323273821 is a deficient number, since it is larger than the sum of its proper divisors (1013101823).

102323273821 is a wasteful number, since it uses less digits than its factorization.

102323273821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013101822.

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 102323273821 in words is "one hundred two billion, three hundred twenty-three million, two hundred seventy-three thousand, eight hundred twenty-one".