21415001 has 4 divisors (see below), whose sum is σ = 22346112. Its totient is φ = 20483892.

The previous prime is 21414983. The next prime is 21415027. The reversal of 21415001 is 10051412.

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 21415001 - 2⁶ = 21414937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21415081) 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, 465521 + ... + 465566.

It is an arithmetic number, because the mean of its divisors is an integer number (5586528).

Almost surely, 2^21415001 is an apocalyptic number.

It is an amenable number.

21415001 is a deficient number, since it is larger than the sum of its proper divisors (931111).

21415001 is an equidigital number, since it uses as much as digits as its factorization.

21415001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931110.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 21415001 is about 4627.6344929132. The cubic root of 21415001 is about 277.6979665760.

Adding to 21415001 its reverse (10051412), we get a palindrome (31466413).

The spelling of 21415001 in words is "twenty-one million, four hundred fifteen thousand, one".