211404323420 has 24 divisors (see below), whose sum is σ = 444478255200. Its totient is φ = 84460933952.

The previous prime is 211404323419. The next prime is 211404323423. The reversal of 211404323420 is 24323404112.

It is a self number, because there is not a number n which added to its sum of digits gives 211404323420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211404323423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6282515 + ... + 6316074.

It is an arithmetic number, because the mean of its divisors is an integer number (18519927300).

Almost surely, 2^211404323420 is an apocalyptic number.

211404323420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211404323420 is an abundant number, since it is smaller than the sum of its proper divisors (233073931780).

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

211404323420 is a wasteful number, since it uses less digits than its factorization.

211404323420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12599437 (or 12599435 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 211404323420 its reverse (24323404112), we get a palindrome (235727727532).

The spelling of 211404323420 in words is "two hundred eleven billion, four hundred four million, three hundred twenty-three thousand, four hundred twenty".