212139734 has 4 divisors (see below), whose sum is σ = 318209604. Its totient is φ = 106069866.

The previous prime is 212139709. The next prime is 212139791. The reversal of 212139734 is 437931212.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 212139734.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53034932 + ... + 53034935.

It is an arithmetic number, because the mean of its divisors is an integer number (79552401).

Almost surely, 2^212139734 is an apocalyptic number.

212139734 is a deficient number, since it is larger than the sum of its proper divisors (106069870).

212139734 is a wasteful number, since it uses less digits than its factorization.

212139734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106069869.

The product of its digits is 9072, while the sum is 32.

The square root of 212139734 is about 14565.0174733846. The cubic root of 212139734 is about 596.4041727232.

The spelling of 212139734 in words is "two hundred twelve million, one hundred thirty-nine thousand, seven hundred thirty-four".