211321434 has 24 divisors (see below), whose sum is σ = 437729760. Its totient is φ = 68009872.

The previous prime is 211321433. The next prime is 211321457. The reversal of 211321434 is 434123112.

It is a self number, because there is not a number n which added to its sum of digits gives 211321434.

It is not an unprimeable number, because it can be changed into a prime (211321433) 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 11 ways as a sum of consecutive naturals, for example, 15894 + ... + 25985.

It is an arithmetic number, because the mean of its divisors is an integer number (18238740).

Almost surely, 2^211321434 is an apocalyptic number.

211321434 is an abundant number, since it is smaller than the sum of its proper divisors (226408326).

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

211321434 is a wasteful number, since it uses less digits than its factorization.

211321434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41942 (or 41913 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 211321434 is about 14536.8990503477. The cubic root of 211321434 is about 595.6363354332.

Adding to 211321434 its reverse (434123112), we get a palindrome (645444546).

The spelling of 211321434 in words is "two hundred eleven million, three hundred twenty-one thousand, four hundred thirty-four".