11621022543256 has 128 divisors (see below), whose sum is σ = 26869047321600. Its totient is φ = 4598549729280.

The previous prime is 11621022543217. The next prime is 11621022543281. The reversal of 11621022543256 is 65234522012611.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27141396 + ... + 27566236.

It is an arithmetic number, because the mean of its divisors is an integer number (209914432200).

Almost surely, 2^{11621022543256} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11621022543256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13434523660800).

11621022543256 is an abundant number, since it is smaller than the sum of its proper divisors (15248024778344).

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

11621022543256 is a wasteful number, since it uses less digits than its factorization.

11621022543256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425417 (or 425413 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

Adding to 11621022543256 its reverse (65234522012611), we get a palindrome (76855544555867).

The spelling of 11621022543256 in words is "eleven trillion, six hundred twenty-one billion, twenty-two million, five hundred forty-three thousand, two hundred fifty-six".