212140140 has 48 divisors (see below), whose sum is σ = 606638592. Its totient is φ = 55366336.

The previous prime is 212140121. The next prime is 212140141. The reversal of 212140140 is 41041212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (212140141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34794 + ... + 40433.

It is an arithmetic number, because the mean of its divisors is an integer number (12638304).

Almost surely, 2^212140140 is an apocalyptic number.

212140140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212140140 is an abundant number, since it is smaller than the sum of its proper divisors (394498452).

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

212140140 is a wasteful number, since it uses less digits than its factorization.

212140140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75286 (or 75284 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 212140140 is about 14565.0314108827. The cubic root of 212140140 is about 596.4045531956.

Adding to 212140140 its reverse (41041212), we get a palindrome (253181352).

The spelling of 212140140 in words is "two hundred twelve million, one hundred forty thousand, one hundred forty".