21484669 has 2 divisors, whose sum is σ = 21484670. Its totient is φ = 21484668.

The previous prime is 21484607. The next prime is 21484681. The reversal of 21484669 is 96648412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 1444 = 4635^2 + 38^2 .

It is a cyclic number.

It is not a de Polignac number, because 21484669 - 2¹⁵ = 21451901 is a prime.

It is a super-2 number, since 2×21484669² = 923182004079122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21484699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10742334 + 10742335.

It is an arithmetic number, because the mean of its divisors is an integer number (10742335).

Almost surely, 2^21484669 is an apocalyptic number.

It is an amenable number.

21484669 is a deficient number, since it is larger than the sum of its proper divisors (1).

21484669 is an equidigital number, since it uses as much as digits as its factorization.

21484669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 40.

The square root of 21484669 is about 4635.1557686878. The cubic root of 21484669 is about 277.9987793884.

The spelling of 21484669 in words is "twenty-one million, four hundred eighty-four thousand, six hundred sixty-nine".