21423035 has 4 divisors (see below), whose sum is σ = 25707648. Its totient is φ = 17138424.

The previous prime is 21423019. The next prime is 21423053. The reversal of 21423035 is 53032412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21423035 - 2⁴ = 21423019 is a prime.

It is a super-2 number, since 2×21423035² = 917892857222450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21422998 and 21423016.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2142299 + ... + 2142308.

It is an arithmetic number, because the mean of its divisors is an integer number (6426912).

Almost surely, 2^21423035 is an apocalyptic number.

21423035 is a deficient number, since it is larger than the sum of its proper divisors (4284613).

21423035 is an equidigital number, since it uses as much as digits as its factorization.

21423035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4284612.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21423035 is about 4628.5024575990. The cubic root of 21423035 is about 277.7326890668.

Adding to 21423035 its reverse (53032412), we get a palindrome (74455447).

The spelling of 21423035 in words is "twenty-one million, four hundred twenty-three thousand, thirty-five".