23220021 has 24 divisors (see below), whose sum is σ = 34780032. Its totient is φ = 13763200.

The previous prime is 23220019. The next prime is 23220037. The reversal of 23220021 is 12002232.

It is not a de Polignac number, because 23220021 - 2¹ = 23220019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23219979 and 23220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23220091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16381 + ... + 17741.

It is an arithmetic number, because the mean of its divisors is an integer number (1449168).

Almost surely, 2^23220021 is an apocalyptic number.

It is an amenable number.

23220021 is a deficient number, since it is larger than the sum of its proper divisors (11560011).

23220021 is a wasteful number, since it uses less digits than its factorization.

23220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433 (or 1422 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 23220021 is about 4818.7157002670. The cubic root of 23220021 is about 285.2906483966.

Adding to 23220021 its reverse (12002232), we get a palindrome (35222253).

It can be divided in two parts, 232200 and 21, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 23220021 in words is "twenty-three million, two hundred twenty thousand, twenty-one".