212391270 has 96 divisors (see below), whose sum is σ = 679678272. Its totient is φ = 44810496.

The previous prime is 212391191. The next prime is 212391271. The reversal of 212391270 is 72193212.

212391270 is a `hidden beast` number, since 2 + 1 + 2 + 391 + 270 = 666.

212391270 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×212391270² = 90220103144425800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212391271) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4777 + ... + 21156.

It is an arithmetic number, because the mean of its divisors is an integer number (7079982).

Almost surely, 2^212391270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212391270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339839136).

212391270 is an abundant number, since it is smaller than the sum of its proper divisors (467287002).

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

212391270 is a wasteful number, since it uses less digits than its factorization.

212391270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25966 (or 25963 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 212391270 is about 14573.6498517015. The cubic root of 212391270 is about 596.6398002253.

The spelling of 212391270 in words is "two hundred twelve million, three hundred ninety-one thousand, two hundred seventy".