212120442 has 24 divisors (see below), whose sum is σ = 475443540. Its totient is φ = 68268480.

The previous prime is 212120411. The next prime is 212120443. The reversal of 212120442 is 244021212.

212120442 is a `hidden beast` number, since 212 + 12 + 0 + 442 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 191517921 + 20602521 = 13839^2 + 4539^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (212120443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202659 + ... + 203702.

Almost surely, 2^212120442 is an apocalyptic number.

212120442 is an abundant number, since it is smaller than the sum of its proper divisors (263323098).

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

212120442 is a wasteful number, since it uses less digits than its factorization.

212120442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406398 (or 406395 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 212120442 is about 14564.3551865505. The cubic root of 212120442 is about 596.3860931649.

Adding to 212120442 its reverse (244021212), we get a palindrome (456141654).

The spelling of 212120442 in words is "two hundred twelve million, one hundred twenty thousand, four hundred forty-two".