10111321220 has 96 divisors (see below), whose sum is σ = 28509739776. Its totient is φ = 2909145600.

The previous prime is 10111321169. The next prime is 10111321223. The reversal of 10111321220 is 2212311101.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 10111321195 and 10111321204.

It is not an unprimeable number, because it can be changed into a prime (10111321223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232511 + ... + 272550.

It is an arithmetic number, because the mean of its divisors is an integer number (296976456).

Almost surely, 2^10111321220 is an apocalyptic number.

10111321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10111321220 is an abundant number, since it is smaller than the sum of its proper divisors (18398418556).

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

10111321220 is a wasteful number, since it uses less digits than its factorization.

10111321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505101 (or 505099 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 10111321220 its reverse (2212311101), we get a palindrome (12323632321).

It can be divided in two parts, 1011 and 1321220, that added together give a palindrome (1322231).

The spelling of 10111321220 in words is "ten billion, one hundred eleven million, three hundred twenty-one thousand, two hundred twenty".