121110010020 has 108 divisors (see below), whose sum is σ = 370974177756. Its totient is φ = 31981944960.

The previous prime is 121110009973. The next prime is 121110010031. The reversal of 121110010020 is 20010011121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30157100964 + 90952909056 = 173658^2 + 301584^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 121110009984 and 121110010011.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1877910 + ... + 1941330.

Almost surely, 2^121110010020 is an apocalyptic number.

121110010020 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 121110010020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185487088878).

121110010020 is an abundant number, since it is smaller than the sum of its proper divisors (249864167736).

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

121110010020 is a wasteful number, since it uses less digits than its factorization.

121110010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63642 (or 63534 counting only the distinct ones).

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

Adding to 121110010020 its reverse (20010011121), we get a palindrome (141120021141).

The spelling of 121110010020 in words is "one hundred twenty-one billion, one hundred ten million, ten thousand, twenty".