21422023 has 16 divisors (see below), whose sum is σ = 26763264. Its totient is φ = 16721280.

The previous prime is 21422021. The next prime is 21422029. The reversal of 21422023 is 32022412.

It is a cyclic number.

It is not a de Polignac number, because 21422023 - 2¹ = 21422021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21421988 and 21422006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 786 + ... + 6592.

It is an arithmetic number, because the mean of its divisors is an integer number (1672704).

Almost surely, 2^21422023 is an apocalyptic number.

21422023 is a deficient number, since it is larger than the sum of its proper divisors (5341241).

21422023 is a wasteful number, since it uses less digits than its factorization.

21422023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5862.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21422023 is about 4628.3931336912. The cubic root of 21422023 is about 277.7283157383.

Adding to 21422023 its reverse (32022412), we get a palindrome (53444435).

The spelling of 21422023 in words is "twenty-one million, four hundred twenty-two thousand, twenty-three".