21401003 has 8 divisors (see below), whose sum is σ = 23103696. Its totient is φ = 19706400.

The previous prime is 21400997. The next prime is 21401047. The reversal of 21401003 is 30010412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21401003 - 2⁸ = 21400747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21401053) 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 7 ways as a sum of consecutive naturals, for example, 4208 + ... + 7778.

It is an arithmetic number, because the mean of its divisors is an integer number (2887962).

Almost surely, 2^21401003 is an apocalyptic number.

21401003 is a deficient number, since it is larger than the sum of its proper divisors (1702693).

21401003 is a wasteful number, since it uses less digits than its factorization.

21401003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4045.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21401003 is about 4626.1218098965. The cubic root of 21401003 is about 277.6374472636.

Adding to 21401003 its reverse (30010412), we get a palindrome (51411415).

The spelling of 21401003 in words is "twenty-one million, four hundred one thousand, three".