12211203540 has 24 divisors (see below), whose sum is σ = 34191370080. Its totient is φ = 3256320928.

The previous prime is 12211203533. The next prime is 12211203541. The reversal of 12211203540 is 4530211221.

It is a super-2 number, since 2×12211203540² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211203541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101759970 + ... + 101760089.

It is an arithmetic number, because the mean of its divisors is an integer number (1424640420).

Almost surely, 2^12211203540 is an apocalyptic number.

12211203540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12211203540 is an abundant number, since it is smaller than the sum of its proper divisors (21980166540).

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

12211203540 is a wasteful number, since it uses less digits than its factorization.

12211203540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203520071 (or 203520069 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 12211203540 its reverse (4530211221), we get a palindrome (16741414761).

The spelling of 12211203540 in words is "twelve billion, two hundred eleven million, two hundred three thousand, five hundred forty".