21774513 has 16 divisors (see below), whose sum is σ = 30985280. Its totient is φ = 13561344.

The previous prime is 21774479. The next prime is 21774517. The reversal of 21774513 is 31547712.

It is not a de Polignac number, because 21774513 - 2⁶ = 21774449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21774517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1545 + ... + 6777.

It is an arithmetic number, because the mean of its divisors is an integer number (1936580).

Almost surely, 2^21774513 is an apocalyptic number.

It is an amenable number.

21774513 is a deficient number, since it is larger than the sum of its proper divisors (9210767).

21774513 is a wasteful number, since it uses less digits than its factorization.

21774513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5328.

The product of its digits is 5880, while the sum is 30.

The square root of 21774513 is about 4666.3168559368. The cubic root of 21774513 is about 279.2433354532.

The spelling of 21774513 in words is "twenty-one million, seven hundred seventy-four thousand, five hundred thirteen".