102123203420 has 96 divisors (see below), whose sum is σ = 259640131968. Its totient is φ = 32937910272.

The previous prime is 102123203401. The next prime is 102123203431. The reversal of 102123203420 is 24302321201.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 102123203392 and 102123203401.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 5447984 + ... + 5466696.

It is an arithmetic number, because the mean of its divisors is an integer number (2704584708).

Almost surely, 2^102123203420 is an apocalyptic number.

102123203420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 102123203420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129820065984).

102123203420 is an abundant number, since it is smaller than the sum of its proper divisors (157516928548).

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

102123203420 is a wasteful number, since it uses less digits than its factorization.

102123203420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21039 (or 21037 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 102123203420 its reverse (24302321201), we get a palindrome (126425524621).

The spelling of 102123203420 in words is "one hundred two billion, one hundred twenty-three million, two hundred three thousand, four hundred twenty".