1001115421 has 2 divisors, whose sum is σ = 1001115422. Its totient is φ = 1001115420.

The previous prime is 1001115419. The next prime is 1001115497. The reversal of 1001115421 is 1245111001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 916272900 + 84842521 = 30270^2 + 9211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001115421 - 2¹ = 1001115419 is a prime.

Together with 1001115419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1001115395 and 1001115404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001115221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500557710 + 500557711.

It is an arithmetic number, because the mean of its divisors is an integer number (500557711).

Almost surely, 2^1001115421 is an apocalyptic number.

It is an amenable number.

1001115421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001115421 is an equidigital number, since it uses as much as digits as its factorization.

1001115421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 1001115421 is about 31640.4080409846. The cubic root of 1001115421 is about 1000.3716688452.

Adding to 1001115421 its reverse (1245111001), we get a palindrome (2246226422).

The spelling of 1001115421 in words is "one billion, one million, one hundred fifteen thousand, four hundred twenty-one".