212111438 has 16 divisors (see below), whose sum is σ = 396676224. Its totient is φ = 82640760.

The previous prime is 212111437. The next prime is 212111443. The reversal of 212111438 is 834111212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688520 + ... + 688827.

It is an arithmetic number, because the mean of its divisors is an integer number (24792264).

Almost surely, 2^212111438 is an apocalyptic number.

212111438 is a deficient number, since it is larger than the sum of its proper divisors (184564786).

212111438 is a wasteful number, since it uses less digits than its factorization.

212111438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377367.

The product of its digits is 384, while the sum is 23.

The square root of 212111438 is about 14564.0460724347. The cubic root of 212111438 is about 596.3776546628.

The spelling of 212111438 in words is "two hundred twelve million, one hundred eleven thousand, four hundred thirty-eight".