21347475 has 12 divisors (see below), whose sum is σ = 35294616. Its totient is φ = 11385280.

The previous prime is 21347467. The next prime is 21347533. The reversal of 21347475 is 57474312.

It is not a de Polignac number, because 21347475 - 2³ = 21347467 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142242 + ... + 142391.

It is an arithmetic number, because the mean of its divisors is an integer number (2941218).

Almost surely, 2^21347475 is an apocalyptic number.

21347475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21347475 is a deficient number, since it is larger than the sum of its proper divisors (13947141).

21347475 is a wasteful number, since it uses less digits than its factorization.

21347475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284646 (or 284641 counting only the distinct ones).

The product of its digits is 23520, while the sum is 33.

The square root of 21347475 is about 4620.3327802227. The cubic root of 21347475 is about 277.4057792291.

The spelling of 21347475 in words is "twenty-one million, three hundred forty-seven thousand, four hundred seventy-five".