211422231240 has 128 divisors (see below), whose sum is σ = 692336332800. Its totient is φ = 51223576320.

The previous prime is 211422231227. The next prime is 211422231247. The reversal of 211422231240 is 42132224112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 211422231240.

It is not an unprimeable number, because it can be changed into a prime (211422231247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2227881 + ... + 2320839.

It is an arithmetic number, because the mean of its divisors is an integer number (5408877600).

Almost surely, 2^211422231240 is an apocalyptic number.

211422231240 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 211422231240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (346168166400).

211422231240 is an abundant number, since it is smaller than the sum of its proper divisors (480914101560).

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

211422231240 is a wasteful number, since it uses less digits than its factorization.

211422231240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94707 (or 94703 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 211422231240 its reverse (42132224112), we get a palindrome (253554455352).

The spelling of 211422231240 in words is "two hundred eleven billion, four hundred twenty-two million, two hundred thirty-one thousand, two hundred forty".