11421001 has 4 divisors (see below), whose sum is σ = 11699604. Its totient is φ = 11142400.

The previous prime is 11420971. The next prime is 11421017. The reversal of 11421001 is 10012411.

11421001 is nontrivially palindromic in base 15.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3326976 + 8094025 = 1824^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 11421001 - 2²¹ = 9323849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11421061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139240 + ... + 139321.

It is an arithmetic number, because the mean of its divisors is an integer number (2924901).

Almost surely, 2^11421001 is an apocalyptic number.

It is an amenable number.

11421001 is a deficient number, since it is larger than the sum of its proper divisors (278603).

11421001 is an equidigital number, since it uses as much as digits as its factorization.

11421001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278602.

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

The square root of 11421001 is about 3379.4971519444. The cubic root of 11421001 is about 225.1998290578.

Adding to 11421001 its reverse (10012411), we get a palindrome (21433412).

It can be divided in two parts, 114 and 21001, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 11421001 in words is "eleven million, four hundred twenty-one thousand, one".