121101021000 has 128 divisors (see below), whose sum is σ = 419816966400. Its totient is φ = 32293598400.

The previous prime is 121101020947. The next prime is 121101021011. The reversal of 121101021000 is 120101121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2215612 + ... + 2269611.

It is an arithmetic number, because the mean of its divisors is an integer number (3279820050).

Almost surely, 2^121101021000 is an apocalyptic number.

121101021000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121101021000 is an abundant number, since it is smaller than the sum of its proper divisors (298715945400).

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

121101021000 is a wasteful number, since it uses less digits than its factorization.

121101021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4485253 (or 4485233 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 121101021000 its reverse (120101121), we get a palindrome (121221122121).

The spelling of 121101021000 in words is "one hundred twenty-one billion, one hundred one million, twenty-one thousand".