102123354821 has 4 divisors (see below), whose sum is σ = 103854259200. Its totient is φ = 100392450444.

The previous prime is 102123354791. The next prime is 102123354833. The reversal of 102123354821 is 128453321201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102123354821 - 2¹⁰ = 102123353797 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 (102123354871) 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, 865452101 + ... + 865452218.

It is an arithmetic number, because the mean of its divisors is an integer number (25963564800).

Almost surely, 2^102123354821 is an apocalyptic number.

It is an amenable number.

102123354821 is a deficient number, since it is larger than the sum of its proper divisors (1730904379).

102123354821 is an equidigital number, since it uses as much as digits as its factorization.

102123354821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730904378.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 102123354821 in words is "one hundred two billion, one hundred twenty-three million, three hundred fifty-four thousand, eight hundred twenty-one".