211230405864 has 96 divisors (see below), whose sum is σ = 606233833920. Its totient is φ = 66213708288.

The previous prime is 211230405853. The next prime is 211230405887. The reversal of 211230405864 is 468504032112.

It is a happy number.

211230405864 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 30 + 40 + 586 + 4 = 666.

It is a super-2 number, since 2×211230405864² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1426399 + ... + 1567505.

It is an arithmetic number, because the mean of its divisors is an integer number (6314935770).

Almost surely, 2^211230405864 is an apocalyptic number.

211230405864 is a gapful number since it is divisible by the number (24) 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 211230405864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303116916960).

211230405864 is an abundant number, since it is smaller than the sum of its proper divisors (395003428056).

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

211230405864 is a wasteful number, since it uses less digits than its factorization.

211230405864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142359 (or 142352 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

Adding to 211230405864 its reverse (468504032112), we get a palindrome (679734437976).

The spelling of 211230405864 in words is "two hundred eleven billion, two hundred thirty million, four hundred five thousand, eight hundred sixty-four".