21471601 has 4 divisors (see below), whose sum is σ = 21551104. Its totient is φ = 21392100.

The previous prime is 21471589. The next prime is 21471631. The reversal of 21471601 is 10617412.

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 a cyclic number.

It is not a de Polignac number, because 21471601 - 2⁷ = 21471473 is a prime.

It is a super-2 number, since 2×21471601² = 922059299006402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21471631) 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, 39345 + ... + 39886.

It is an arithmetic number, because the mean of its divisors is an integer number (5387776).

Almost surely, 2^21471601 is an apocalyptic number.

It is an amenable number.

21471601 is a deficient number, since it is larger than the sum of its proper divisors (79503).

21471601 is an equidigital number, since it uses as much as digits as its factorization.

21471601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79502.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21471601 is about 4633.7458929035. The cubic root of 21471601 is about 277.9424039196.

The spelling of 21471601 in words is "twenty-one million, four hundred seventy-one thousand, six hundred one".