10121121020 has 144 divisors (see below), whose sum is σ = 24805992960. Its totient is φ = 3451954176.

The previous prime is 10121120993. The next prime is 10121121061. The reversal of 10121121020 is 2012112101.

It is a junction number, because it is equal to n+sod(n) for n = 10121120992 and 10121121010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2523857 + ... + 2527863.

It is an arithmetic number, because the mean of its divisors is an integer number (172263840).

Almost surely, 2^10121121020 is an apocalyptic number.

10121121020 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 10121121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12402996480).

10121121020 is an abundant number, since it is smaller than the sum of its proper divisors (14684871940).

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

10121121020 is a wasteful number, since it uses less digits than its factorization.

10121121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092 (or 4073 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10121121020 its reverse (2012112101), we get a palindrome (12133233121).

The spelling of 10121121020 in words is "ten billion, one hundred twenty-one million, one hundred twenty-one thousand, twenty".