121000121020 has 24 divisors (see below), whose sum is σ = 259506644544. Its totient is φ = 47370259776.

The previous prime is 121000120993. The next prime is 121000121057. The reversal of 121000121020 is 20121000121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 121000120988 and 121000121006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64360827 + ... + 64362706.

It is an arithmetic number, because the mean of its divisors is an integer number (10812776856).

Almost surely, 2^121000121020 is an apocalyptic number.

121000121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121000121020 is an abundant number, since it is smaller than the sum of its proper divisors (138506523524).

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

121000121020 is a wasteful number, since it uses less digits than its factorization.

121000121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128723589 (or 128723587 counting only the distinct ones).

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

Adding to 121000121020 its reverse (20121000121), we get a palindrome (141121121141).

The spelling of 121000121020 in words is "one hundred twenty-one billion, one hundred twenty-one thousand, twenty".