11021221121100 has 72 divisors (see below), whose sum is σ = 32216809481808. Its totient is φ = 2908693401600.

The previous prime is 11021221121047. The next prime is 11021221121123. The reversal of 11021221121100 is 112112212011.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 11021221121100.

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, 189338961 + ... + 189397160.

Almost surely, 2^{11021221121100} is an apocalyptic number.

11021221121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11021221121100 is an abundant number, since it is smaller than the sum of its proper divisors (21195588360708).

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

11021221121100 is a wasteful number, since it uses less digits than its factorization.

11021221121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378736235 (or 378736228 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 11021221121100 its reverse (112112212011), we get a palindrome (11133333333111).

It can be divided in two parts, 1102122 and 1121100, that added together give a palindrome (2223222).

The spelling of 11021221121100 in words is "eleven trillion, twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred".