21452023 has 4 divisors (see below), whose sum is σ = 21467920. Its totient is φ = 21436128.

The previous prime is 21452021. The next prime is 21452027. The reversal of 21452023 is 32025412.

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 21452023 - 2¹ = 21452021 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5715 + ... + 8692.

It is an arithmetic number, because the mean of its divisors is an integer number (5366980).

Almost surely, 2^21452023 is an apocalyptic number.

21452023 is a deficient number, since it is larger than the sum of its proper divisors (15897).

21452023 is a wasteful number, since it uses less digits than its factorization.

21452023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15896.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21452023 is about 4631.6328654158. The cubic root of 21452023 is about 277.8579014317.

Adding to 21452023 its reverse (32025412), we get a palindrome (53477435).

It can be divided in two parts, 2 and 1452023, that added together give a square (1452025 = 1205²).

The spelling of 21452023 in words is "twenty-one million, four hundred fifty-two thousand, twenty-three".