21003141 has 4 divisors (see below), whose sum is σ = 28004192. Its totient is φ = 14002092.

The previous prime is 21003139. The next prime is 21003173. The reversal of 21003141 is 14130012.

Added to its reverse (14130012) it gives a triangular number (35133153 = T₈₃₈₂).

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21003141 - 2¹ = 21003139 is a prime.

It is a super-2 number, since 2×21003141² = 882263863731762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003121) 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, 3500521 + ... + 3500526.

It is an arithmetic number, because the mean of its divisors is an integer number (7001048).

Almost surely, 2^21003141 is an apocalyptic number.

It is an amenable number.

21003141 is a deficient number, since it is larger than the sum of its proper divisors (7001051).

21003141 is an equidigital number, since it uses as much as digits as its factorization.

21003141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7001050.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21003141 is about 4582.9183933385. The cubic root of 21003141 is about 275.9061721601.

Adding to 21003141 its reverse (14130012), we get a palindrome (35133153).

The spelling of 21003141 in words is "twenty-one million, three thousand, one hundred forty-one".