212421042 has 20 divisors (see below), whose sum is σ = 475980846. Its totient is φ = 70806960.

The previous prime is 212421029. The next prime is 212421043. The reversal of 212421042 is 240124212.

It can be written as a sum of positive squares in only one way, i.e., 197374401 + 15046641 = 14049^2 + 3879^2 .

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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 (212421043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 655459 + ... + 655782.

Almost surely, 2^212421042 is an apocalyptic number.

212421042 is an abundant number, since it is smaller than the sum of its proper divisors (263559804).

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

212421042 is a wasteful number, since it uses less digits than its factorization.

212421042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311255 (or 1311246 counting only the distinct ones).

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

The square root of 212421042 is about 14574.6712484364. The cubic root of 212421042 is about 596.6676769677.

Adding to 212421042 its reverse (240124212), we get a palindrome (452545254).

The spelling of 212421042 in words is "two hundred twelve million, four hundred twenty-one thousand, forty-two".