23203143421 has 2 divisors, whose sum is σ = 23203143422. Its totient is φ = 23203143420.

The previous prime is 23203143401. The next prime is 23203143449. The reversal of 23203143421 is 12434130232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20473603396 + 2729540025 = 143086^2 + 52245^2 .

It is a cyclic number.

It is not a de Polignac number, because 23203143421 - 2¹³ = 23203135229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23203143401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11601571710 + 11601571711.

It is an arithmetic number, because the mean of its divisors is an integer number (11601571711).

Almost surely, 2^23203143421 is an apocalyptic number.

It is an amenable number.

23203143421 is a deficient number, since it is larger than the sum of its proper divisors (1).

23203143421 is an equidigital number, since it uses as much as digits as its factorization.

23203143421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 23203143421 its reverse (12434130232), we get a palindrome (35637273653).

The spelling of 23203143421 in words is "twenty-three billion, two hundred three million, one hundred forty-three thousand, four hundred twenty-one".