21476773 has 2 divisors, whose sum is σ = 21476774. Its totient is φ = 21476772.

The previous prime is 21476771. The next prime is 21476789. The reversal of 21476773 is 37767412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16378209 + 5098564 = 4047^2 + 2258^2 .

It is a cyclic number.

It is not a de Polignac number, because 21476773 - 2¹ = 21476771 is a prime.

It is a super-2 number, since 2×21476773² = 922503556987058, which contains 22 as substring.

Together with 21476771, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21476771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10738386 + 10738387.

It is an arithmetic number, because the mean of its divisors is an integer number (10738387).

Almost surely, 2^21476773 is an apocalyptic number.

It is an amenable number.

21476773 is a deficient number, since it is larger than the sum of its proper divisors (1).

21476773 is an equidigital number, since it uses as much as digits as its factorization.

21476773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 37.

The square root of 21476773 is about 4634.3039391046. The cubic root of 21476773 is about 277.9647187081.

It can be divided in two parts, 214767 and 73, that added together give a triangular number (214840 = T₆₅₅).

The spelling of 21476773 in words is "twenty-one million, four hundred seventy-six thousand, seven hundred seventy-three".