243540211220 has 96 divisors (see below), whose sum is σ = 524670048000. Its totient is φ = 94930304000.

The previous prime is 243540211199. The next prime is 243540211223. The reversal of 243540211220 is 22112045342.

It is a super-3 number, since 3×243540211220³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243540211220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243540211223) 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, 116025731 + ... + 116027829.

It is an arithmetic number, because the mean of its divisors is an integer number (5465313000).

Almost surely, 2^243540211220 is an apocalyptic number.

243540211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243540211220 is an abundant number, since it is smaller than the sum of its proper divisors (281129836780).

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

243540211220 is a wasteful number, since it uses less digits than its factorization.

243540211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3089 (or 3087 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 243540211220 its reverse (22112045342), we get a palindrome (265652256562).

The spelling of 243540211220 in words is "two hundred forty-three billion, five hundred forty million, two hundred eleven thousand, two hundred twenty".