21375574 has 16 divisors (see below), whose sum is σ = 35168256. Its totient is φ = 9663400.

The previous prime is 21375569. The next prime is 21375577. The reversal of 21375574 is 47557312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375577) 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, 1659 + ... + 6745.

It is an arithmetic number, because the mean of its divisors is an integer number (2198016).

Almost surely, 2^21375574 is an apocalyptic number.

21375574 is a deficient number, since it is larger than the sum of its proper divisors (13792682).

21375574 is a wasteful number, since it uses less digits than its factorization.

21375574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5291.

The product of its digits is 29400, while the sum is 34.

The square root of 21375574 is about 4623.3725785405. The cubic root of 21375574 is about 277.5274393233.

The spelling of 21375574 in words is "twenty-one million, three hundred seventy-five thousand, five hundred seventy-four".