21967669 has 2 divisors, whose sum is σ = 21967670. Its totient is φ = 21967668.

The previous prime is 21967663. The next prime is 21967709. The reversal of 21967669 is 96676912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16851025 + 5116644 = 4105^2 + 2262^2 .

It is a cyclic number.

It is not a de Polignac number, because 21967669 - 2³ = 21967661 is a prime.

It is a super-2 number, since 2×21967669² = 965156962587122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21967661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10983834 + 10983835.

It is an arithmetic number, because the mean of its divisors is an integer number (10983835).

Almost surely, 2^21967669 is an apocalyptic number.

It is an amenable number.

21967669 is a deficient number, since it is larger than the sum of its proper divisors (1).

21967669 is an equidigital number, since it uses as much as digits as its factorization.

21967669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 21967669 is about 4686.9679964770. The cubic root of 21967669 is about 280.0666040535.

The spelling of 21967669 in words is "twenty-one million, nine hundred sixty-seven thousand, six hundred sixty-nine".