21141001 has 6 divisors (see below), whose sum is σ = 24592650. Its totient is φ = 18120816.

The previous prime is 21140957. The next prime is 21141007. The reversal of 21141001 is 10014112.

It can be written as a sum of positive squares in only one way, i.e., 19758025 + 1382976 = 4445^2 + 1176^2 .

It is not a de Polignac number, because 21141001 - 2¹⁵ = 21108233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21141007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215676 + ... + 215773.

It is an arithmetic number, because the mean of its divisors is an integer number (4098775).

Almost surely, 2^21141001 is an apocalyptic number.

It is an amenable number.

21141001 is a deficient number, since it is larger than the sum of its proper divisors (3451649).

21141001 is an equidigital number, since it uses as much as digits as its factorization.

21141001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431463 (or 431456 counting only the distinct ones).

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

The square root of 21141001 is about 4597.9344275446. The cubic root of 21141001 is about 276.5085186715.

Adding to 21141001 its reverse (10014112), we get a palindrome (31155113).

The spelling of 21141001 in words is "twenty-one million, one hundred forty-one thousand, one".