212111140 has 24 divisors (see below), whose sum is σ = 446624640. Its totient is φ = 84617568.

The previous prime is 212111111. The next prime is 212111147. The reversal of 212111140 is 41111212.

It is a super-2 number, since 2×212111140² = 89982271424199200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212111140.

It is not an unprimeable number, because it can be changed into a prime (212111147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6412 + ... + 21571.

It is an arithmetic number, because the mean of its divisors is an integer number (18609360).

Almost surely, 2^212111140 is an apocalyptic number.

212111140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212111140 is an abundant number, since it is smaller than the sum of its proper divisors (234513500).

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

212111140 is a wasteful number, since it uses less digits than its factorization.

212111140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28371 (or 28369 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 212111140 is about 14564.0358417576. The cubic root of 212111140 is about 596.3773753747.

Adding to 212111140 its reverse (41111212), we get a palindrome (253222352).

The spelling of 212111140 in words is "two hundred twelve million, one hundred eleven thousand, one hundred forty".