21119547 has 4 divisors (see below), whose sum is σ = 28159400. Its totient is φ = 14079696.

The previous prime is 21119531. The next prime is 21119561. The reversal of 21119547 is 74591112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21119547 - 2⁴ = 21119531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21119647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3519922 + ... + 3519927.

It is an arithmetic number, because the mean of its divisors is an integer number (7039850).

Almost surely, 2^21119547 is an apocalyptic number.

21119547 is a deficient number, since it is larger than the sum of its proper divisors (7039853).

21119547 is an equidigital number, since it uses as much as digits as its factorization.

21119547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7039852.

The product of its digits is 2520, while the sum is 30.

The square root of 21119547 is about 4595.6008312298. The cubic root of 21119547 is about 276.4149529100.

The spelling of 21119547 in words is "twenty-one million, one hundred nineteen thousand, five hundred forty-seven".