23421220 has 12 divisors (see below), whose sum is σ = 49184604. Its totient is φ = 9368480.

The previous prime is 23421217. The next prime is 23421221. The reversal of 23421220 is 2212432.

It can be written as a sum of positive squares in 2 ways, for example, as 17842176 + 5579044 = 4224^2 + 2362^2 .

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 23421194 and 23421203.

It is not an unprimeable number, because it can be changed into a prime (23421221) 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, 585511 + ... + 585550.

It is an arithmetic number, because the mean of its divisors is an integer number (4098717).

Almost surely, 2^23421220 is an apocalyptic number.

23421220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23421220 is an abundant number, since it is smaller than the sum of its proper divisors (25763384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23421220 is a wasteful number, since it uses less digits than its factorization.

23421220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171070 (or 1171068 counting only the distinct ones).

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

The square root of 23421220 is about 4839.5474995086. The cubic root of 23421220 is about 286.1122841425.

Adding to 23421220 its reverse (2212432), we get a palindrome (25633652).

The spelling of 23421220 in words is "twenty-three million, four hundred twenty-one thousand, two hundred twenty".