211431432340 has 48 divisors (see below), whose sum is σ = 450830886912. Its totient is φ = 83273705856.

The previous prime is 211431432301. The next prime is 211431432353. The reversal of 211431432340 is 43234134112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 211431432299 and 211431432308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3124909 + ... + 3191851.

It is an arithmetic number, because the mean of its divisors is an integer number (9392310144).

Almost surely, 2^211431432340 is an apocalyptic number.

211431432340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211431432340 is an abundant number, since it is smaller than the sum of its proper divisors (239399454572).

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

211431432340 is a wasteful number, since it uses less digits than its factorization.

211431432340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69376 (or 69374 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 211431432340 its reverse (43234134112), we get a palindrome (254665566452).

The spelling of 211431432340 in words is "two hundred eleven billion, four hundred thirty-one million, four hundred thirty-two thousand, three hundred forty".