212021342 has 32 divisors (see below), whose sum is σ = 364936320. Its totient is φ = 91571040.

The previous prime is 212021333. The next prime is 212021353. The reversal of 212021342 is 243120212.

It is a self number, because there is not a number n which added to its sum of digits gives 212021342.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 38417 + ... + 43587.

It is an arithmetic number, because the mean of its divisors is an integer number (11404260).

Almost surely, 2^212021342 is an apocalyptic number.

212021342 is a deficient number, since it is larger than the sum of its proper divisors (152914978).

212021342 is a wasteful number, since it uses less digits than its factorization.

212021342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5288.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 212021342 is about 14560.9526474060. The cubic root of 212021342 is about 596.2932040063.

Adding to 212021342 its reverse (243120212), we get a palindrome (455141554).

The spelling of 212021342 in words is "two hundred twelve million, twenty-one thousand, three hundred forty-two".