21773141 has 16 divisors (see below), whose sum is σ = 25147584. Its totient is φ = 18672384.

The previous prime is 21773137. The next prime is 21773149. The reversal of 21773141 is 14137712.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21773141 - 2² = 21773137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21773141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21773149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17750 + ... + 18936.

It is an arithmetic number, because the mean of its divisors is an integer number (1571724).

Almost surely, 2^21773141 is an apocalyptic number.

It is an amenable number.

21773141 is a deficient number, since it is larger than the sum of its proper divisors (3374443).

21773141 is a wasteful number, since it uses less digits than its factorization.

21773141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300.

The product of its digits is 1176, while the sum is 26.

The square root of 21773141 is about 4666.1698426011. The cubic root of 21773141 is about 279.2374703407.

The spelling of 21773141 in words is "twenty-one million, seven hundred seventy-three thousand, one hundred forty-one".