21029465 has 8 divisors (see below), whose sum is σ = 25272648. Its totient is φ = 16798720.

The previous prime is 21029453. The next prime is 21029483. The reversal of 21029465 is 56492012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 635209 + 20394256 = 797^2 + 4516^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21029465 - 2⁶ = 21029401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1145 + ... + 6585.

It is an arithmetic number, because the mean of its divisors is an integer number (3159081).

Almost surely, 2^21029465 is an apocalyptic number.

It is an amenable number.

21029465 is a deficient number, since it is larger than the sum of its proper divisors (4243183).

21029465 is an equidigital number, since it uses as much as digits as its factorization.

21029465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6219.

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

The square root of 21029465 is about 4585.7894631132. The cubic root of 21029465 is about 276.0213917817.

The spelling of 21029465 in words is "twenty-one million, twenty-nine thousand, four hundred sixty-five".