23108421 has 12 divisors (see below), whose sum is σ = 35246432. Its totient is φ = 13192224.

The previous prime is 23108417. The next prime is 23108431. The reversal of 23108421 is 12480132.

It is not a de Polignac number, because 23108421 - 2² = 23108417 is a prime.

It is a super-2 number, since 2×23108421² = 1067998242226482, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23108411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21505 + ... + 22553.

Almost surely, 2^23108421 is an apocalyptic number.

23108421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23108421 is a deficient number, since it is larger than the sum of its proper divisors (12138011).

23108421 is an frugal number, since it uses more digits than its factorization.

23108421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 23108421 is about 4807.1219040087. The cubic root of 23108421 is about 284.8328598319.

Multiplying 23108421 by its sum of digits (21), we get a square (485276841 = 22029²).

23108421 divided by its sum of digits (21) gives a square (1100401 = 1049²).

Adding to 23108421 its reverse (12480132), we get a palindrome (35588553).

It can be divided in two parts, 2310 and 8421, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 23108421 in words is "twenty-three million, one hundred eight thousand, four hundred twenty-one".