121211001100 has 54 divisors (see below), whose sum is σ = 305971210860. Its totient is φ = 41558055840.

The previous prime is 121211001091. The next prime is 121211001133. The reversal of 121211001100 is 1100112121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12363570 + ... + 12373369.

Almost surely, 2^121211001100 is an apocalyptic number.

121211001100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211001100 is an abundant number, since it is smaller than the sum of its proper divisors (184760209760).

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

121211001100 is a wasteful number, since it uses less digits than its factorization.

121211001100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24736967 (or 24736953 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 121211001100 its reverse (1100112121), we get a palindrome (122311113221).

The spelling of 121211001100 in words is "one hundred twenty-one billion, two hundred eleven million, one thousand, one hundred".