212146540 has 12 divisors (see below), whose sum is σ = 445507776. Its totient is φ = 84858608.

The previous prime is 212146523. The next prime is 212146559. The reversal of 212146540 is 45641212.

It is a happy 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, 5303644 + ... + 5303683.

It is an arithmetic number, because the mean of its divisors is an integer number (37125648).

Almost surely, 2^212146540 is an apocalyptic number.

212146540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212146540 is an abundant number, since it is smaller than the sum of its proper divisors (233361236).

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

212146540 is a wasteful number, since it uses less digits than its factorization.

212146540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10607336 (or 10607334 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 212146540 is about 14565.2511135236. The cubic root of 212146540 is about 596.4105507259.

Adding to 212146540 its reverse (45641212), we get a palindrome (257787752).

The spelling of 212146540 in words is "two hundred twelve million, one hundred forty-six thousand, five hundred forty".