421212123 has 16 divisors (see below), whose sum is σ = 628212000. Its totient is φ = 278920800.

The previous prime is 421212101. The next prime is 421212131. The reversal of 421212123 is 321212124.

It is a happy number.

It is not a de Polignac number, because 421212123 - 2⁵ = 421212091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421212096 and 421212105.

It is not an unprimeable number, because it can be changed into a prime (421212163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48328 + ... + 56373.

It is an arithmetic number, because the mean of its divisors is an integer number (39263250).

Almost surely, 2^421212123 is an apocalyptic number.

421212123 is a deficient number, since it is larger than the sum of its proper divisors (206999877).

421212123 is a wasteful number, since it uses less digits than its factorization.

421212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104859 (or 104853 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 421212123 is about 20523.4529989473. The cubic root of 421212123 is about 749.6069780810.

Adding to 421212123 its reverse (321212124), we get a palindrome (742424247).

Subtracting from 421212123 its reverse (321212124), we obtain a palindrome (99999999).

It can be divided in two parts, 42121 and 2123, that added together give a palindrome (44244).

The spelling of 421212123 in words is "four hundred twenty-one million, two hundred twelve thousand, one hundred twenty-three".