121021311000 has 64 divisors (see below), whose sum is σ = 377586499680. Its totient is φ = 32272348800.

The previous prime is 121021310983. The next prime is 121021311001. The reversal of 121021311000 is 113120121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021311001) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 20167219 + ... + 20173218.

Almost surely, 2^121021311000 is an apocalyptic number.

121021311000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021311000 is an abundant number, since it is smaller than the sum of its proper divisors (256565188680).

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

121021311000 is a wasteful number, since it uses less digits than its factorization.

121021311000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40340461 (or 40340447 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 121021311000 its reverse (113120121), we get a palindrome (121134431121).

The spelling of 121021311000 in words is "one hundred twenty-one billion, twenty-one million, three hundred eleven thousand".