21485001 has 4 divisors (see below), whose sum is σ = 28646672. Its totient is φ = 14323332.

The previous prime is 21484997. The next prime is 21485011. The reversal of 21485001 is 10058412.

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 21485001 - 2² = 21484997 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21485011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3580831 + ... + 3580836.

It is an arithmetic number, because the mean of its divisors is an integer number (7161668).

Almost surely, 2^21485001 is an apocalyptic number.

It is an amenable number.

21485001 is a deficient number, since it is larger than the sum of its proper divisors (7161671).

21485001 is an equidigital number, since it uses as much as digits as its factorization.

21485001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7161670.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 21485001 is about 4635.1915818011. The cubic root of 21485001 is about 278.0002113416. Note that the first 3 decimals are identical.

The spelling of 21485001 in words is "twenty-one million, four hundred eighty-five thousand, one".