21774985 has 8 divisors (see below), whose sum is σ = 26737920. Its totient is φ = 17014704.

The previous prime is 21774983. The next prime is 21775031. The reversal of 21774985 is 58947712.

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 21774985 - 2¹ = 21774983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (21774983) 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, 50425 + ... + 50854.

It is an arithmetic number, because the mean of its divisors is an integer number (3342240).

Almost surely, 2^21774985 is an apocalyptic number.

It is an amenable number.

21774985 is a deficient number, since it is larger than the sum of its proper divisors (4962935).

21774985 is a wasteful number, since it uses less digits than its factorization.

21774985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101327.

The product of its digits is 141120, while the sum is 43.

The square root of 21774985 is about 4666.3674308824. The cubic root of 21774985 is about 279.2453531317.

The spelling of 21774985 in words is "twenty-one million, seven hundred seventy-four thousand, nine hundred eighty-five".