11212355420 has 72 divisors (see below), whose sum is σ = 27661616640. Its totient is φ = 3806140800.

The previous prime is 11212355387. The next prime is 11212355431. The reversal of 11212355420 is 2455321211.

It is a self number, because there is not a number n which added to its sum of digits gives 11212355420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42341 + ... + 155619.

It is an arithmetic number, because the mean of its divisors is an integer number (384189120).

Almost surely, 2^11212355420 is an apocalyptic number.

11212355420 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 11212355420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13830808320).

11212355420 is an abundant number, since it is smaller than the sum of its proper divisors (16449261220).

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

11212355420 is a wasteful number, since it uses less digits than its factorization.

11212355420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113403 (or 113394 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 11212355420 its reverse (2455321211), we get a palindrome (13667676631).

The spelling of 11212355420 in words is "eleven billion, two hundred twelve million, three hundred fifty-five thousand, four hundred twenty".