21465029 has 2 divisors, whose sum is σ = 21465030. Its totient is φ = 21465028.

The previous prime is 21465013. The next prime is 21465061. The reversal of 21465029 is 92056412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12602500 + 8862529 = 3550^2 + 2977^2 .

It is a cyclic number.

It is not a de Polignac number, because 21465029 - 2⁴ = 21465013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21464992 and 21465010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21461029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732514 + 10732515.

It is an arithmetic number, because the mean of its divisors is an integer number (10732515).

Almost surely, 2^21465029 is an apocalyptic number.

It is an amenable number.

21465029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21465029 is an equidigital number, since it uses as much as digits as its factorization.

21465029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21465029 is about 4633.0366931420. The cubic root of 21465029 is about 277.9140436081.

The spelling of 21465029 in words is "twenty-one million, four hundred sixty-five thousand, twenty-nine".