211431434120 has 16 divisors (see below), whose sum is σ = 475720726860. Its totient is φ = 84572573632.

The previous prime is 211431434117. The next prime is 211431434153. The reversal of 211431434120 is 21434134112.

It can be written as a sum of positive squares in 2 ways, for example, as 198119351236 + 13312082884 = 445106^2 + 115378^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211431434120.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2642892887 + ... + 2642892966.

Almost surely, 2^211431434120 is an apocalyptic number.

211431434120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211431434120 is an abundant number, since it is smaller than the sum of its proper divisors (264289292740).

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

211431434120 is a wasteful number, since it uses less digits than its factorization.

211431434120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5285785864 (or 5285785860 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 211431434120 its reverse (21434134112), we get a palindrome (232865568232).

The spelling of 211431434120 in words is "two hundred eleven billion, four hundred thirty-one million, four hundred thirty-four thousand, one hundred twenty".