121000212100 has 18 divisors (see below), whose sum is σ = 262570460474. Its totient is φ = 48400084800.

The previous prime is 121000212077. The next prime is 121000212139. The reversal of 121000212100 is 1212000121.

It can be written as a sum of positive squares in 3 ways, for example, as 6528963204 + 114471248896 = 80802^2 + 338336^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 605000961 + ... + 605001160.

Almost surely, 2^121000212100 is an apocalyptic number.

121000212100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121000212100 is an abundant number, since it is smaller than the sum of its proper divisors (141570248374).

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

121000212100 is a wasteful number, since it uses less digits than its factorization.

121000212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210002135 (or 1210002128 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121000212100 its reverse (1212000121), we get a palindrome (122212212221).

The spelling of 121000212100 in words is "one hundred twenty-one billion, two hundred twelve thousand, one hundred".