23032821 has 32 divisors (see below), whose sum is σ = 37509120. Its totient is φ = 12285504.

The previous prime is 23032817. The next prime is 23032829. The reversal of 23032821 is 12823032.

It is not a de Polignac number, because 23032821 - 2² = 23032817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23032829) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20215 + ... + 21323.

It is an arithmetic number, because the mean of its divisors is an integer number (1172160).

Almost surely, 2^23032821 is an apocalyptic number.

23032821 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23032821 is a deficient number, since it is larger than the sum of its proper divisors (14476299).

23032821 is a wasteful number, since it uses less digits than its factorization.

23032821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 23032821 is about 4799.2521292385. The cubic root of 23032821 is about 284.5219069638.

Adding to 23032821 its reverse (12823032), we get a palindrome (35855853).

The spelling of 23032821 in words is "twenty-three million, thirty-two thousand, eight hundred twenty-one".