1000121000 has 32 divisors (see below), whose sum is σ = 2340285480. Its totient is φ = 400048000.

The previous prime is 1000120997. The next prime is 1000121041. The reversal of 1000121000 is 1210001.

It is a happy number.

1000121000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 665743204 + 334377796 = 25802^2 + 18286^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

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, 499061 + ... + 501060.

Almost surely, 2^1000121000 is an apocalyptic number.

1000121000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000121000 is an abundant number, since it is smaller than the sum of its proper divisors (1340164480).

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

1000121000 is a wasteful number, since it uses less digits than its factorization.

1000121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000142 (or 1000128 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 1000121000 is about 31624.6897217981. The cubic root of 1000121000 is about 1000.0403317067.

Adding to 1000121000 its reverse (1210001), we get a palindrome (1001331001).

It can be divided in two parts, 1000 and 121000, that multiplied together give a square (121000000 = 11000²).

The spelling of 1000121000 in words is "one billion, one hundred twenty-one thousand".