121020000000 has 288 divisors, whose sum is σ = 402810687552. Its totient is φ = 32256000000.

The previous prime is 121019999983. The next prime is 121020000041. The reversal of 121020000000 is 20121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59998992 + ... + 60001008.

Almost surely, 2^121020000000 is an apocalyptic number.

121020000000 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 121020000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201405343776).

121020000000 is an abundant number, since it is smaller than the sum of its proper divisors (281790687552).

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

121020000000 is an frugal number, since it uses more digits than its factorization.

121020000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071 (or 2027 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 121020000000 its reverse (20121), we get a palindrome (121020020121).

The spelling of 121020000000 in words is "one hundred twenty-one billion, twenty million", and thus it is an aban number.