212203540 has 12 divisors (see below), whose sum is σ = 445627476. Its totient is φ = 84881408.

The previous prime is 212203531. The next prime is 212203553. The reversal of 212203540 is 45302212.

It can be written as a sum of positive squares in 2 ways, for example, as 38912644 + 173290896 = 6238^2 + 13164^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 5305069 + ... + 5305108.

It is an arithmetic number, because the mean of its divisors is an integer number (37135623).

Almost surely, 2^212203540 is an apocalyptic number.

212203540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212203540 is an abundant number, since it is smaller than the sum of its proper divisors (233423936).

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

212203540 is a wasteful number, since it uses less digits than its factorization.

212203540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610186 (or 10610184 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 212203540 is about 14567.2076939954. The cubic root of 212203540 is about 596.4639609099.

Adding to 212203540 its reverse (45302212), we get a palindrome (257505752).

The spelling of 212203540 in words is "two hundred twelve million, two hundred three thousand, five hundred forty".