123211152 has 80 divisors (see below), whose sum is σ = 358598080. Its totient is φ = 40497408.

The previous prime is 123211141. The next prime is 123211159. The reversal of 123211152 is 251112321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (123211159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29583 + ... + 33489.

It is an arithmetic number, because the mean of its divisors is an integer number (4482476).

Almost surely, 2^123211152 is an apocalyptic number.

123211152 is a gapful number since it is divisible by the number (12) 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 123211152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179299040).

123211152 is an abundant number, since it is smaller than the sum of its proper divisors (235386928).

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

123211152 is a wasteful number, since it uses less digits than its factorization.

123211152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3997 (or 3985 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 123211152 is about 11100.0518917706. The cubic root of 123211152 is about 497.6034003069.

Adding to 123211152 its reverse (251112321), we get a palindrome (374323473).

The spelling of 123211152 in words is "one hundred twenty-three million, two hundred eleven thousand, one hundred fifty-two".