21467653 has 2 divisors, whose sum is σ = 21467654. Its totient is φ = 21467652.

The previous prime is 21467639. The next prime is 21467657. The reversal of 21467653 is 35676412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18852964 + 2614689 = 4342^2 + 1617^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21467653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21467657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10733826 + 10733827.

It is an arithmetic number, because the mean of its divisors is an integer number (10733827).

Almost surely, 2^21467653 is an apocalyptic number.

It is an amenable number.

21467653 is a deficient number, since it is larger than the sum of its proper divisors (1).

21467653 is an equidigital number, since it uses as much as digits as its factorization.

21467653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 34.

The square root of 21467653 is about 4633.3198680859. The cubic root of 21467653 is about 277.9253677133.

The spelling of 21467653 in words is "twenty-one million, four hundred sixty-seven thousand, six hundred fifty-three".