21470775 has 24 divisors (see below), whose sum is σ = 36259584. Its totient is φ = 11205600.

The previous prime is 21470737. The next prime is 21470783. The reversal of 21470775 is 57707412.

It is a happy number.

It is not a de Polignac number, because 21470775 - 2¹³ = 21462583 is a prime.

It is a congruent number.

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, 480 + ... + 6570.

It is an arithmetic number, because the mean of its divisors is an integer number (1510816).

Almost surely, 2^21470775 is an apocalyptic number.

21470775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21470775 is a deficient number, since it is larger than the sum of its proper divisors (14788809).

21470775 is a wasteful number, since it uses less digits than its factorization.

21470775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6151 (or 6146 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 33.

The square root of 21470775 is about 4633.6567632918. The cubic root of 21470775 is about 277.9388397796.

The spelling of 21470775 in words is "twenty-one million, four hundred seventy thousand, seven hundred seventy-five".