211431433420 has 96 divisors (see below), whose sum is σ = 482679429120. Its totient is φ = 77500177920.

The previous prime is 211431433373. The next prime is 211431433457. The reversal of 211431433420 is 24334134112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47435832 + ... + 47440288.

It is an arithmetic number, because the mean of its divisors is an integer number (5027910720).

Almost surely, 2^211431433420 is an apocalyptic number.

211431433420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211431433420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241339714560).

211431433420 is an abundant number, since it is smaller than the sum of its proper divisors (271247995700).

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

211431433420 is a wasteful number, since it uses less digits than its factorization.

211431433420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8543 (or 8541 counting only the distinct ones).

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

Adding to 211431433420 its reverse (24334134112), we get a palindrome (235765567532).

The spelling of 211431433420 in words is "two hundred eleven billion, four hundred thirty-one million, four hundred thirty-three thousand, four hundred twenty".