21465030 has 32 divisors (see below), whose sum is σ = 51775488. Its totient is φ = 5695200.

The previous prime is 21465029. The next prime is 21465061. The reversal of 21465030 is 3056412.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21464988 and 21465006.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 4635 + ... + 8025.

It is an arithmetic number, because the mean of its divisors is an integer number (1617984).

Almost surely, 2^21465030 is an apocalyptic number.

21465030 is an abundant number, since it is smaller than the sum of its proper divisors (30310458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21465030 is a wasteful number, since it uses less digits than its factorization.

21465030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3612.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21465030 is about 4633.0368010626. The cubic root of 21465030 is about 277.9140479239.

The spelling of 21465030 in words is "twenty-one million, four hundred sixty-five thousand, thirty".