121000221100 has 36 divisors (see below), whose sum is σ = 286440526008. Its totient is φ = 44000080000.

The previous prime is 121000221079. The next prime is 121000221113. The reversal of 121000221100 is 1122000121.

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 11 ways as a sum of consecutive naturals, for example, 54999001 + ... + 55001200.

It is an arithmetic number, because the mean of its divisors is an integer number (7956681278).

Almost surely, 2^121000221100 is an apocalyptic number.

121000221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121000221100 is an abundant number, since it is smaller than the sum of its proper divisors (165440304908).

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

121000221100 is a wasteful number, since it uses less digits than its factorization.

121000221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110000226 (or 110000219 counting only the distinct ones).

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

Adding to 121000221100 its reverse (1122000121), we get a palindrome (122122221221).

The spelling of 121000221100 in words is "one hundred twenty-one billion, two hundred twenty-one thousand, one hundred".