11321221323220 has 24 divisors (see below), whose sum is σ = 24594377358600. Its totient is φ = 4372333752192.

The previous prime is 11321221323199. The next prime is 11321221323229. The reversal of 11321221323220 is 2232312212311.

It can be written as a sum of positive squares in 4 ways, for example, as 4656325253904 + 6664896069316 = 2157852^2 + 2581646^2 .

It is a super-2 number, since 2×11321221323220² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11321221323229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9759672975 + ... + 9759674134.

It is an arithmetic number, because the mean of its divisors is an integer number (1024765723275).

Almost surely, 2^{11321221323220} is an apocalyptic number.

11321221323220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11321221323220 is an abundant number, since it is smaller than the sum of its proper divisors (13273156035380).

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

11321221323220 is a wasteful number, since it uses less digits than its factorization.

11321221323220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19519347147 (or 19519347145 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 11321221323220 its reverse (2232312212311), we get a palindrome (13553533535531).

The spelling of 11321221323220 in words is "eleven trillion, three hundred twenty-one billion, two hundred twenty-one million, three hundred twenty-three thousand, two hundred twenty".