212242540 has 24 divisors (see below), whose sum is σ = 469168560. Its totient is φ = 80428608.

The previous prime is 212242531. The next prime is 212242567. The reversal of 212242540 is 45242212.

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, 278887 + ... + 279646.

It is an arithmetic number, because the mean of its divisors is an integer number (19548690).

Almost surely, 2^212242540 is an apocalyptic number.

212242540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212242540 is an abundant number, since it is smaller than the sum of its proper divisors (256926020).

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

212242540 is a wasteful number, since it uses less digits than its factorization.

212242540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558561 (or 558559 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 212242540 is about 14568.5462555466. The cubic root of 212242540 is about 596.5004992095.

Adding to 212242540 its reverse (45242212), we get a palindrome (257484752).

The spelling of 212242540 in words is "two hundred twelve million, two hundred forty-two thousand, five hundred forty".