121200211100 has 18 divisors (see below), whose sum is σ = 263004458304. Its totient is φ = 48480084400.

The previous prime is 121200211049. The next prime is 121200211109. The reversal of 121200211100 is 1112002121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200211109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 606000956 + ... + 606001155.

Almost surely, 2^121200211100 is an apocalyptic number.

121200211100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200211100 is an abundant number, since it is smaller than the sum of its proper divisors (141804247204).

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

121200211100 is a wasteful number, since it uses less digits than its factorization.

121200211100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212002125 (or 1212002118 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121200211100 its reverse (1112002121), we get a palindrome (122312213221).

The spelling of 121200211100 in words is "one hundred twenty-one billion, two hundred million, two hundred eleven thousand, one hundred".