121021020000 has 240 divisors, whose sum is σ = 441083245680. Its totient is φ = 32272128000.

The previous prime is 121021019947. The next prime is 121021020019. The reversal of 121021020000 is 20120121.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-4 number, since 4×121021020000⁴ (a number of 45 digits) contains 4444 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 427944 + ... + 652056.

It is an arithmetic number, because the mean of its divisors is an integer number (1837846857).

Almost surely, 2^121021020000 is an apocalyptic number.

121021020000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121021020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220541622840).

121021020000 is an abundant number, since it is smaller than the sum of its proper divisors (320062225680).

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

121021020000 is an equidigital number, since it uses as much as digits as its factorization.

121021020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224152 (or 224123 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 121021020000 its reverse (20120121), we get a palindrome (121041140121).

The spelling of 121021020000 in words is "one hundred twenty-one billion, twenty-one million, twenty thousand".