212540140 has 12 divisors (see below), whose sum is σ = 446334336. Its totient is φ = 85016048.

The previous prime is 212540131. The next prime is 212540143. The reversal of 212540140 is 41045212.

It is a super-2 number, since 2×212540140² = 90346622222439200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212540143) 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, 5313484 + ... + 5313523.

It is an arithmetic number, because the mean of its divisors is an integer number (37194528).

Almost surely, 2^212540140 is an apocalyptic number.

212540140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212540140 is an abundant number, since it is smaller than the sum of its proper divisors (233794196).

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

212540140 is a wasteful number, since it uses less digits than its factorization.

212540140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10627016 (or 10627014 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 212540140 is about 14578.7564627440. The cubic root of 212540140 is about 596.7791672572.

Adding to 212540140 its reverse (41045212), we get a palindrome (253585352).

The spelling of 212540140 in words is "two hundred twelve million, five hundred forty thousand, one hundred forty".