211311143420 has 96 divisors (see below), whose sum is σ = 506747441088. Its totient is φ = 73324449792.

The previous prime is 211311143411. The next prime is 211311143441. The reversal of 211311143420 is 24341113112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2983862 + ... + 3053858.

It is an arithmetic number, because the mean of its divisors is an integer number (5278619178).

Almost surely, 2^211311143420 is an apocalyptic number.

211311143420 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 211311143420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253373720544).

211311143420 is an abundant number, since it is smaller than the sum of its proper divisors (295436297668).

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

211311143420 is a wasteful number, since it uses less digits than its factorization.

211311143420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70719 (or 70717 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 211311143420 its reverse (24341113112), we get a palindrome (235652256532).

The spelling of 211311143420 in words is "two hundred eleven billion, three hundred eleven million, one hundred forty-three thousand, four hundred twenty".