1001400121 has 4 divisors (see below), whose sum is σ = 1002879972. Its totient is φ = 999920272.

The previous prime is 1001400109. The next prime is 1001400133. The reversal of 1001400121 is 1210041001.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1001400109) and next prime (1001400133).

It can be written as a sum of positive squares in 2 ways, for example, as 650250000 + 351150121 = 25500^2 + 18739^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001400121 - 2⁵ = 1001400089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001400098 and 1001400107.

It is not an unprimeable number, because it can be changed into a prime (1001400721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738910 + ... + 740263.

It is an arithmetic number, because the mean of its divisors is an integer number (250719993).

Almost surely, 2^1001400121 is an apocalyptic number.

It is an amenable number.

1001400121 is a deficient number, since it is larger than the sum of its proper divisors (1479851).

1001400121 is an equidigital number, since it uses as much as digits as its factorization.

1001400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479850.

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

The square root of 1001400121 is about 31644.9067149834. The cubic root of 1001400121 is about 1000.4664893538.

Adding to 1001400121 its reverse (1210041001), we get a palindrome (2211441122).

The spelling of 1001400121 in words is "one billion, one million, four hundred thousand, one hundred twenty-one".