21410001 has 28 divisors (see below), whose sum is σ = 32894928. Its totient is φ = 13920984.

The previous prime is 21409991. The next prime is 21410003. The reversal of 21410001 is 10001412.

It is a happy number.

It is not a de Polignac number, because 21410001 - 2⁹ = 21409489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21410003) 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 27 ways as a sum of consecutive naturals, for example, 31006 + ... + 31688.

Almost surely, 2^21410001 is an apocalyptic number.

It is an amenable number.

21410001 is a deficient number, since it is larger than the sum of its proper divisors (11484927).

21410001 is an frugal number, since it uses more digits than its factorization.

21410001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744 (or 729 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 21410001 is about 4627.0942285629. The cubic root of 21410001 is about 277.6763524762.

Adding to 21410001 its reverse (10001412), we get a palindrome (31411413).

The spelling of 21410001 in words is "twenty-one million, four hundred ten thousand, one".