23402021 has 4 divisors (see below), whose sum is σ = 23972844. Its totient is φ = 22831200.

The previous prime is 23402009. The next prime is 23402039. The reversal of 23402021 is 12020432.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11464996 + 11937025 = 3386^2 + 3455^2 .

It is a cyclic number.

It is not a de Polignac number, because 23402021 - 2¹⁰ = 23400997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23401987 and 23402005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23402051) 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 3 ways as a sum of consecutive naturals, for example, 285350 + ... + 285431.

It is an arithmetic number, because the mean of its divisors is an integer number (5993211).

Almost surely, 2^23402021 is an apocalyptic number.

It is an amenable number.

23402021 is a deficient number, since it is larger than the sum of its proper divisors (570823).

23402021 is an equidigital number, since it uses as much as digits as its factorization.

23402021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570822.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 23402021 is about 4837.5635396344. The cubic root of 23402021 is about 286.0340848092.

Adding to 23402021 its reverse (12020432), we get a palindrome (35422453).

The spelling of 23402021 in words is "twenty-three million, four hundred two thousand, twenty-one".