21466513 has 2 divisors, whose sum is σ = 21466514. Its totient is φ = 21466512.

The previous prime is 21466457. The next prime is 21466517. The reversal of 21466513 is 31566412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21224449 + 242064 = 4607^2 + 492^2 .

It is a cyclic number.

It is not a de Polignac number, because 21466513 - 2¹³ = 21458321 is a prime.

It is a super-2 number, since 2×21466513² = 921622360758338, which contains 22 as substring.

It is equal to p_1357624 and since 21466513 and 1357624 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21466517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10733256 + 10733257.

It is an arithmetic number, because the mean of its divisors is an integer number (10733257).

Almost surely, 2^21466513 is an apocalyptic number.

It is an amenable number.

21466513 is a deficient number, since it is larger than the sum of its proper divisors (1).

21466513 is an equidigital number, since it uses as much as digits as its factorization.

21466513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 21466513 is about 4633.1968445124. The cubic root of 21466513 is about 277.9204480553.

The spelling of 21466513 in words is "twenty-one million, four hundred sixty-six thousand, five hundred thirteen".