1000121111010 has 160 divisors (see below), whose sum is σ = 3080909589120. Its totient is φ = 228039660288.

The previous prime is 1000121110999. The next prime is 1000121111023. The reversal of 1000121111010 is 101111210001.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1000121110983 and 1000121111001.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2103397 + ... + 2534663.

It is an arithmetic number, because the mean of its divisors is an integer number (19255684932).

Almost surely, 2^{1000121111010} is an apocalyptic number.

1000121111010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1000121111010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1540454794560).

1000121111010 is an abundant number, since it is smaller than the sum of its proper divisors (2080788478110).

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

1000121111010 is a wasteful number, since it uses less digits than its factorization.

1000121111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431702 (or 431693 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 1000121111010 its reverse (101111210001), we get a palindrome (1101232321011).

The spelling of 1000121111010 in words is "one trillion, one hundred twenty-one million, one hundred eleven thousand, ten".