121011221100 has 144 divisors (see below), whose sum is σ = 436520560896. Its totient is φ = 25145184000.

The previous prime is 121011221081. The next prime is 121011221117. The reversal of 121011221100 is 1122110121.

121011221100 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×121011221100² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2596191 + ... + 2642390.

It is an arithmetic number, because the mean of its divisors is an integer number (3031392784).

Almost surely, 2^121011221100 is an apocalyptic number.

121011221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121011221100 is an abundant number, since it is smaller than the sum of its proper divisors (315509339796).

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

121011221100 is a wasteful number, since it uses less digits than its factorization.

121011221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5238616 (or 5238609 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121011221100 its reverse (1122110121), we get a palindrome (122133331221).

The spelling of 121011221100 in words is "one hundred twenty-one billion, eleven million, two hundred twenty-one thousand, one hundred".