123212555 has 4 divisors (see below), whose sum is σ = 147855072. Its totient is φ = 98570040.

The previous prime is 123212513. The next prime is 123212567. The reversal of 123212555 is 555212321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 555212321 = 2729 ⋅203449.

It is not a de Polignac number, because 123212555 - 2¹⁰ = 123211531 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12321251 + ... + 12321260.

It is an arithmetic number, because the mean of its divisors is an integer number (36963768).

Almost surely, 2^123212555 is an apocalyptic number.

123212555 is a deficient number, since it is larger than the sum of its proper divisors (24642517).

123212555 is an equidigital number, since it uses as much as digits as its factorization.

123212555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24642516.

The product of its digits is 3000, while the sum is 26.

The square root of 123212555 is about 11100.1150894934. The cubic root of 123212555 is about 497.6052890291.

Adding to 123212555 its reverse (555212321), we get a palindrome (678424876).

The spelling of 123212555 in words is "one hundred twenty-three million, two hundred twelve thousand, five hundred fifty-five".