123421123212420 has 48 divisors (see below), whose sum is σ = 376995430905408. Its totient is φ = 29920272293760.

The previous prime is 123421123212407. The next prime is 123421123212473. The reversal of 123421123212420 is 24212321124321.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93500850259 + ... + 93500851578.

It is an arithmetic number, because the mean of its divisors is an integer number (7854071477196).

Almost surely, 2^{123421123212420} is an apocalyptic number.

123421123212420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123421123212420 is an abundant number, since it is smaller than the sum of its proper divisors (253574307692988).

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

123421123212420 is a wasteful number, since it uses less digits than its factorization.

123421123212420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187001701860 (or 187001701858 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 123421123212420 its reverse (24212321124321), we get a palindrome (147633444336741).

The spelling of 123421123212420 in words is "one hundred twenty-three trillion, four hundred twenty-one billion, one hundred twenty-three million, two hundred twelve thousand, four hundred twenty".