212143240 has 16 divisors (see below), whose sum is σ = 477322380. Its totient is φ = 84857280.

The previous prime is 212143147. The next prime is 212143241. The reversal of 212143240 is 42341212.

It can be written as a sum of positive squares in 2 ways, for example, as 209728324 + 2414916 = 14482^2 + 1554^2 .

It is not an unprimeable number, because it can be changed into a prime (212143241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2651751 + ... + 2651830.

Almost surely, 2^212143240 is an apocalyptic number.

212143240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212143240 is an abundant number, since it is smaller than the sum of its proper divisors (265179140).

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

212143240 is a wasteful number, since it uses less digits than its factorization.

212143240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5303592 (or 5303588 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 212143240 is about 14565.1378297632. The cubic root of 212143240 is about 596.4074582644.

Adding to 212143240 its reverse (42341212), we get a palindrome (254484452).

The spelling of 212143240 in words is "two hundred twelve million, one hundred forty-three thousand, two hundred forty".