21967771 has 8 divisors (see below), whose sum is σ = 25208064. Its totient is φ = 18753000.

The previous prime is 21967769. The next prime is 21967793. The reversal of 21967771 is 17776912.

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

It is not a de Polignac number, because 21967771 - 2¹ = 21967769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21967721) 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, 4495 + ... + 8008.

It is an arithmetic number, because the mean of its divisors is an integer number (3151008).

Almost surely, 2^21967771 is an apocalyptic number.

21967771 is a deficient number, since it is larger than the sum of its proper divisors (3240293).

21967771 is a wasteful number, since it uses less digits than its factorization.

21967771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12761.

The product of its digits is 37044, while the sum is 40.

The square root of 21967771 is about 4686.9788776994. The cubic root of 21967771 is about 280.0670375200.

The spelling of 21967771 in words is "twenty-one million, nine hundred sixty-seven thousand, seven hundred seventy-one".