212042540 has 12 divisors (see below), whose sum is σ = 445289376. Its totient is φ = 84817008.

The previous prime is 212042477. The next prime is 212042569. The reversal of 212042540 is 45240212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 10602127 = 212042540 / (2 + 1 + 2 + 0 + 4 + 2 + 5 + 4 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5301044 + ... + 5301083.

It is an arithmetic number, because the mean of its divisors is an integer number (37107448).

Almost surely, 2^212042540 is an apocalyptic number.

212042540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212042540 is an abundant number, since it is smaller than the sum of its proper divisors (233246836).

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

212042540 is a wasteful number, since it uses less digits than its factorization.

212042540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10602136 (or 10602134 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 212042540 is about 14561.6805348833. The cubic root of 212042540 is about 596.3130759085.

Adding to 212042540 its reverse (45240212), we get a palindrome (257282752).

The spelling of 212042540 in words is "two hundred twelve million, forty-two thousand, five hundred forty".