211423131240 has 32 divisors (see below), whose sum is σ = 634269394080. Its totient is φ = 56379501632.

The previous prime is 211423131223. The next prime is 211423131247. The reversal of 211423131240 is 42131324112.

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 211423131240.

It is not an unprimeable number, because it can be changed into a prime (211423131247) 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, 880929594 + ... + 880929833.

It is an arithmetic number, because the mean of its divisors is an integer number (19820918565).

Almost surely, 2^211423131240 is an apocalyptic number.

211423131240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211423131240 is an abundant number, since it is smaller than the sum of its proper divisors (422846262840).

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

211423131240 is a wasteful number, since it uses less digits than its factorization.

211423131240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761859441 (or 1761859437 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 211423131240 its reverse (42131324112), we get a palindrome (253554455352).

The spelling of 211423131240 in words is "two hundred eleven billion, four hundred twenty-three million, one hundred thirty-one thousand, two hundred forty".