212321240 has 32 divisors (see below), whose sum is σ = 484457760. Its totient is φ = 83731200.

The previous prime is 212321203. The next prime is 212321261. The reversal of 212321240 is 42123212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34541 + ... + 40220.

It is an arithmetic number, because the mean of its divisors is an integer number (15139305).

Almost surely, 2^212321240 is an apocalyptic number.

212321240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212321240 is an abundant number, since it is smaller than the sum of its proper divisors (272136520).

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

212321240 is a wasteful number, since it uses less digits than its factorization.

212321240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74843 (or 74839 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 212321240 is about 14571.2470296814. The cubic root of 212321240 is about 596.5742179970.

Adding to 212321240 its reverse (42123212), we get a palindrome (254444452).

The spelling of 212321240 in words is "two hundred twelve million, three hundred twenty-one thousand, two hundred forty".