23203021421 has 16 divisors (see below), whose sum is σ = 25066589184. Its totient is φ = 21396021504.

The previous prime is 23203021411. The next prime is 23203021441. The reversal of 23203021421 is 12412030232.

It is a cyclic number.

It is not a de Polignac number, because 23203021421 - 2⁶ = 23203021357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23203021393 and 23203021402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23203021411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 637316 + ... + 672738.

It is an arithmetic number, because the mean of its divisors is an integer number (1566661824).

Almost surely, 2^23203021421 is an apocalyptic number.

It is an amenable number.

23203021421 is a deficient number, since it is larger than the sum of its proper divisors (1863567763).

23203021421 is a wasteful number, since it uses less digits than its factorization.

23203021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36220.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 23203021421 its reverse (12412030232), we get a palindrome (35615051653).

The spelling of 23203021421 in words is "twenty-three billion, two hundred three million, twenty-one thousand, four hundred twenty-one".