21471401 has 8 divisors (see below), whose sum is σ = 24575040. Its totient is φ = 18376848.

The previous prime is 21471389. The next prime is 21471403. The reversal of 21471401 is 10417412.

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

It is not a de Polignac number, because 21471401 - 2⁶ = 21471337 is a prime.

It is a super-2 number, since 2×21471401² = 922042121805602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21471403) 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 7 ways as a sum of consecutive naturals, for example, 3935 + ... + 7643.

It is an arithmetic number, because the mean of its divisors is an integer number (3071880).

Almost surely, 2^21471401 is an apocalyptic number.

It is an amenable number.

21471401 is a deficient number, since it is larger than the sum of its proper divisors (3103639).

21471401 is an equidigital number, since it uses as much as digits as its factorization.

21471401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4543.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 21471401 is about 4633.7243120410. The cubic root of 21471401 is about 277.9415409401.

Adding to 21471401 its reverse (10417412), we get a palindrome (31888813).

The spelling of 21471401 in words is "twenty-one million, four hundred seventy-one thousand, four hundred one".