23227821 has 12 divisors (see below), whose sum is σ = 33693660. Its totient is φ = 15419520.

The previous prime is 23227807. The next prime is 23227837. The reversal of 23227821 is 12872232.

23227821 = T₃₁₃ + T₃₁₄ + ... + T₅₅₃.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20385225 + 2842596 = 4515^2 + 1686^2 .

It is not a de Polignac number, because 23227821 - 2¹⁴ = 23211437 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23227891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3186 + ... + 7523.

It is an arithmetic number, because the mean of its divisors is an integer number (2807805).

Almost surely, 2^23227821 is an apocalyptic number.

It is an amenable number.

23227821 is a deficient number, since it is larger than the sum of its proper divisors (10465839).

23227821 is a wasteful number, since it uses less digits than its factorization.

23227821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10956 (or 10953 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 23227821 is about 4819.5249765926. The cubic root of 23227821 is about 285.3225894808.

The spelling of 23227821 in words is "twenty-three million, two hundred twenty-seven thousand, eight hundred twenty-one".