21423003330 has 128 divisors (see below), whose sum is σ = 54060120576. Its totient is φ = 5427302400.

The previous prime is 21423003323. The next prime is 21423003341. The reversal of 21423003330 is 3330032412.

It is a junction number, because it is equal to n+sod(n) for n = 21423003297 and 21423003306.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14177275 + ... + 14178785.

It is an arithmetic number, because the mean of its divisors is an integer number (422344692).

Almost surely, 2^21423003330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21423003330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27030060288).

21423003330 is an abundant number, since it is smaller than the sum of its proper divisors (32637117246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21423003330 is a wasteful number, since it uses less digits than its factorization.

21423003330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852.

The product of its (nonzero) digits is 1296, while the sum is 21.

Adding to 21423003330 its reverse (3330032412), we get a palindrome (24753035742).

The spelling of 21423003330 in words is "twenty-one billion, four hundred twenty-three million, three thousand, three hundred thirty".