23403202221 has 16 divisors (see below), whose sum is σ = 35668755584. Its totient is φ = 13370733504.

The previous prime is 23403202129. The next prime is 23403202247. The reversal of 23403202221 is 12220230432.

It is not a de Polignac number, because 23403202221 - 2¹³ = 23403194029 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23403202321) 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, 11691 + ... + 216663.

It is an arithmetic number, because the mean of its divisors is an integer number (2229297224).

Almost surely, 2^23403202221 is an apocalyptic number.

23403202221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23403202221 is a deficient number, since it is larger than the sum of its proper divisors (12265553363).

23403202221 is a wasteful number, since it uses less digits than its factorization.

23403202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210420.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 23403202221 its reverse (12220230432), we get a palindrome (35623432653).

The spelling of 23403202221 in words is "twenty-three billion, four hundred three million, two hundred two thousand, two hundred twenty-one".