21341403 has 6 divisors (see below), whose sum is σ = 30826484. Its totient is φ = 14227596.

The previous prime is 21341387. The next prime is 21341407. The reversal of 21341403 is 30414312.

It is not a de Polignac number, because 21341403 - 2⁴ = 21341387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21341407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1185625 + ... + 1185642.

Almost surely, 2^21341403 is an apocalyptic number.

21341403 is a deficient number, since it is larger than the sum of its proper divisors (9485081).

21341403 is a wasteful number, since it uses less digits than its factorization.

21341403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2371273 (or 2371270 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21341403 is about 4619.6756379642. The cubic root of 21341403 is about 277.3794752966.

Adding to 21341403 its reverse (30414312), we get a palindrome (51755715).

It can be divided in two parts, 213 and 41403, that added together give a triangular number (41616 = T₂₈₈).

The spelling of 21341403 in words is "twenty-one million, three hundred forty-one thousand, four hundred three".