22403430021 has 16 divisors (see below), whose sum is σ = 35239804928. Its totient is φ = 12388993200.

The previous prime is 22403430019. The next prime is 22403430041. The reversal of 22403430021 is 12003430422.

It is not a de Polignac number, because 22403430021 - 2¹ = 22403430019 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22403430021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22403430011) 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, 17206285 + ... + 17207586.

It is an arithmetic number, because the mean of its divisors is an integer number (2202487808).

Almost surely, 2^22403430021 is an apocalyptic number.

22403430021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22403430021 is a deficient number, since it is larger than the sum of its proper divisors (12836374907).

22403430021 is a wasteful number, since it uses less digits than its factorization.

22403430021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34413912.

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

Adding to 22403430021 its reverse (12003430422), we get a palindrome (34406860443).

The spelling of 22403430021 in words is "twenty-two billion, four hundred three million, four hundred thirty thousand, twenty-one".