21301375 has 16 divisors (see below), whose sum is σ = 27986400. Its totient is φ = 16142400.

The previous prime is 21301363. The next prime is 21301403. The reversal of 21301375 is 57310312.

It is not a de Polignac number, because 21301375 - 2¹⁹ = 20777087 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2110 + ... + 6859.

It is an arithmetic number, because the mean of its divisors is an integer number (1749150).

Almost surely, 2^21301375 is an apocalyptic number.

21301375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21301375 is a deficient number, since it is larger than the sum of its proper divisors (6685025).

21301375 is an equidigital number, since it uses as much as digits as its factorization.

21301375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9003 (or 8993 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 21301375 is about 4615.3412658221. The cubic root of 21301375 is about 277.2059488349.

Adding to 21301375 its reverse (57310312), we get a palindrome (78611687).

The spelling of 21301375 in words is "twenty-one million, three hundred one thousand, three hundred seventy-five".