212831228 has 24 divisors (see below), whose sum is σ = 402760512. Its totient is φ = 98023424.

The previous prime is 212831221. The next prime is 212831243. The reversal of 212831228 is 822138212.

It is a super-2 number, since 2×212831228² = 90594263223975968, 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 212831228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212831221) 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, 30101 + ... + 36492.

It is an arithmetic number, because the mean of its divisors is an integer number (16781688).

Almost surely, 2^212831228 is an apocalyptic number.

It is an amenable number.

212831228 is a deficient number, since it is larger than the sum of its proper divisors (189929284).

212831228 is a wasteful number, since it uses less digits than its factorization.

212831228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66661 (or 66659 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 212831228 is about 14588.7363400673. The cubic root of 212831228 is about 597.0514860289.

The spelling of 212831228 in words is "two hundred twelve million, eight hundred thirty-one thousand, two hundred twenty-eight".