201212424 has 120 divisors (see below), whose sum is σ = 655697790. Its totient is φ = 57480192.

The previous prime is 201212419. The next prime is 201212443. The reversal of 201212424 is 424212102.

It can be written as a sum of positive squares in only one way, i.e., 181764324 + 19448100 = 13482^2 + 4410^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 201212397 and 201212406.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 28584 + ... + 34920.

Almost surely, 2^201212424 is an apocalyptic number.

201212424 is a gapful number since it is divisible by the number (24) 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 201212424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327848895).

201212424 is an abundant number, since it is smaller than the sum of its proper divisors (454485366).

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

201212424 is a wasteful number, since it uses less digits than its factorization.

201212424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369 (or 6349 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 201212424 is about 14184.9365173060. The cubic root of 201212424 is about 585.9828841774.

Adding to 201212424 its reverse (424212102), we get a palindrome (625424526).

The spelling of 201212424 in words is "two hundred one million, two hundred twelve thousand, four hundred twenty-four".