12212052540 has 192 divisors, whose sum is σ = 36761195520. Its totient is φ = 3023104000.

The previous prime is 12212052509. The next prime is 12212052557. The reversal of 12212052540 is 4525021221.

It is a self number, because there is not a number n which added to its sum of digits gives 12212052540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5063935 + ... + 5066345.

It is an arithmetic number, because the mean of its divisors is an integer number (191464560).

Almost surely, 2^12212052540 is an apocalyptic number.

12212052540 is a gapful number since it is divisible by the number (10) 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 12212052540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18380597760).

12212052540 is an abundant number, since it is smaller than the sum of its proper divisors (24549142980).

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

12212052540 is a wasteful number, since it uses less digits than its factorization.

12212052540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564 (or 2562 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 12212052540 its reverse (4525021221), we get a palindrome (16737073761).

The spelling of 12212052540 in words is "twelve billion, two hundred twelve million, fifty-two thousand, five hundred forty".