1000122121 has 8 divisors (see below), whose sum is σ = 1066062600. Its totient is φ = 934971648.

The previous prime is 1000122091. The next prime is 1000122161. The reversal of 1000122121 is 1212210001.

It can be written as a sum of positive squares in 4 ways, for example, as 38440000 + 961682121 = 6200^2 + 31011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1000122121 - 2¹¹ = 1000120073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000122098 and 1000122107.

It is not an unprimeable number, because it can be changed into a prime (1000122161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194886 + ... + 199951.

It is an arithmetic number, because the mean of its divisors is an integer number (133257825).

Almost surely, 2^1000122121 is an apocalyptic number.

It is an amenable number.

1000122121 is a deficient number, since it is larger than the sum of its proper divisors (65940479).

1000122121 is a wasteful number, since it uses less digits than its factorization.

1000122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395003.

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

The square root of 1000122121 is about 31624.7074452871. The cubic root of 1000122121 is about 1000.0407053431.

Adding to 1000122121 its reverse (1212210001), we get a palindrome (2212332122).

The spelling of 1000122121 in words is "one billion, one hundred twenty-two thousand, one hundred twenty-one".