123421210455 has 16 divisors (see below), whose sum is σ = 206059760640. Its totient is φ = 62962704288.

The previous prime is 123421210411. The next prime is 123421210459. The reversal of 123421210455 is 554012124321.

It is not a de Polignac number, because 123421210455 - 2¹⁵ = 123421177687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123421210459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178870975 + ... + 178871664.

It is an arithmetic number, because the mean of its divisors is an integer number (12878735040).

Almost surely, 2^123421210455 is an apocalyptic number.

123421210455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123421210455 is a deficient number, since it is larger than the sum of its proper divisors (82638550185).

123421210455 is a wasteful number, since it uses less digits than its factorization.

123421210455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357742670.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 123421210455 its reverse (554012124321), we get a palindrome (677433334776).

The spelling of 123421210455 in words is "one hundred twenty-three billion, four hundred twenty-one million, two hundred ten thousand, four hundred fifty-five".