21774735 has 12 divisors (see below), whose sum is σ = 37742952. Its totient is φ = 11613168.

The previous prime is 21774733. The next prime is 21774749. The reversal of 21774735 is 53747712.

It is not a de Polignac number, because 21774735 - 2¹ = 21774733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21774735.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21774733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 241897 + ... + 241986.

It is an arithmetic number, because the mean of its divisors is an integer number (3145246).

Almost surely, 2^21774735 is an apocalyptic number.

21774735 is a deficient number, since it is larger than the sum of its proper divisors (15968217).

21774735 is a wasteful number, since it uses less digits than its factorization.

21774735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483894 (or 483891 counting only the distinct ones).

The product of its digits is 41160, while the sum is 36.

The square root of 21774735 is about 4666.3406433736. The cubic root of 21774735 is about 279.2442844497.

The spelling of 21774735 in words is "twenty-one million, seven hundred seventy-four thousand, seven hundred thirty-five".