21773361 has 16 divisors (see below), whose sum is σ = 29804544. Its totient is φ = 14132304.

The previous prime is 21773359. The next prime is 21773363. The reversal of 21773361 is 16337712.

It is an interprime number because it is at equal distance from previous prime (21773359) and next prime (21773363).

It is not a de Polignac number, because 21773361 - 2¹ = 21773359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21773363) 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 15 ways as a sum of consecutive naturals, for example, 43036 + ... + 43538.

It is an arithmetic number, because the mean of its divisors is an integer number (1862784).

Almost surely, 2^21773361 is an apocalyptic number.

It is an amenable number.

21773361 is a deficient number, since it is larger than the sum of its proper divisors (8031183).

21773361 is a wasteful number, since it uses less digits than its factorization.

21773361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860.

The product of its digits is 5292, while the sum is 30.

The square root of 21773361 is about 4666.1934164799. The cubic root of 21773361 is about 279.2384108272.

The spelling of 21773361 in words is "twenty-one million, seven hundred seventy-three thousand, three hundred sixty-one".