21327475 has 24 divisors (see below), whose sum is σ = 28748160. Its totient is φ = 15601920.

The previous prime is 21327451. The next prime is 21327511. The reversal of 21327475 is 57472312.

It is not a de Polignac number, because 21327475 - 2¹³ = 21319283 is a prime.

It is a super-2 number, since 2×21327475² = 909722379751250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44286 + ... + 44764.

It is an arithmetic number, because the mean of its divisors is an integer number (1197840).

Almost surely, 2^21327475 is an apocalyptic number.

21327475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21327475 is a deficient number, since it is larger than the sum of its proper divisors (7420685).

21327475 is a wasteful number, since it uses less digits than its factorization.

21327475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 634 counting only the distinct ones).

The product of its digits is 11760, while the sum is 31.

The square root of 21327475 is about 4618.1679267866. The cubic root of 21327475 is about 277.3191202819.

Adding to 21327475 its reverse (57472312), we get a palindrome (78799787).

The spelling of 21327475 in words is "twenty-one million, three hundred twenty-seven thousand, four hundred seventy-five".