21345301 has 4 divisors (see below), whose sum is σ = 21397900. Its totient is φ = 21292704.

The previous prime is 21345287. The next prime is 21345347. The reversal of 21345301 is 10354312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7986276 + 13359025 = 2826^2 + 3655^2 .

It is a cyclic number.

It is not a de Polignac number, because 21345301 - 2¹³ = 21337109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345371) 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, 25686 + ... + 26503.

It is an arithmetic number, because the mean of its divisors is an integer number (5349475).

Almost surely, 2^21345301 is an apocalyptic number.

It is an amenable number.

21345301 is a deficient number, since it is larger than the sum of its proper divisors (52599).

21345301 is an equidigital number, since it uses as much as digits as its factorization.

21345301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52598.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21345301 is about 4620.0975097935. The cubic root of 21345301 is about 277.3963620242.

Adding to 21345301 its reverse (10354312), we get a palindrome (31699613).

The spelling of 21345301 in words is "twenty-one million, three hundred forty-five thousand, three hundred one".