211256434 has 4 divisors (see below), whose sum is σ = 316884654. Its totient is φ = 105628216.

The previous prime is 211256431. The next prime is 211256471. The reversal of 211256434 is 434652112.

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

It can be written as a sum of positive squares in only one way, i.e., 109307025 + 101949409 = 10455^2 + 10097^2 .

It is not an unprimeable number, because it can be changed into a prime (211256431) 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 as a sum of consecutive naturals, namely, 52814107 + ... + 52814110.

Almost surely, 2^211256434 is an apocalyptic number.

211256434 is a deficient number, since it is larger than the sum of its proper divisors (105628220).

211256434 is a wasteful number, since it uses less digits than its factorization.

211256434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105628219.

The product of its digits is 5760, while the sum is 28.

The square root of 211256434 is about 14534.6631883921. The cubic root of 211256434 is about 595.5752589152.

The spelling of 211256434 in words is "two hundred eleven million, two hundred fifty-six thousand, four hundred thirty-four".