21774413 has 8 divisors (see below), whose sum is σ = 22037400. Its totient is φ = 21513280.

The previous prime is 21774391. The next prime is 21774419. The reversal of 21774413 is 31447712.

It can be written as a sum of positive squares in 4 ways, for example, as 779689 + 20994724 = 883^2 + 4582^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21774413 - 2¹² = 21770317 is a prime.

It is a super-2 number, since 2×21774413² = 948250122989138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21774419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47003 + ... + 47463.

It is an arithmetic number, because the mean of its divisors is an integer number (2754675).

Almost surely, 2^21774413 is an apocalyptic number.

It is an amenable number.

21774413 is a deficient number, since it is larger than the sum of its proper divisors (262987).

21774413 is a wasteful number, since it uses less digits than its factorization.

21774413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927.

The product of its digits is 4704, while the sum is 29.

The square root of 21774413 is about 4666.3061408356. The cubic root of 21774413 is about 279.2429079752.

The spelling of 21774413 in words is "twenty-one million, seven hundred seventy-four thousand, four hundred thirteen".