21001033430 has 96 divisors (see below), whose sum is σ = 42849933120. Its totient is φ = 7393351680.

The previous prime is 21001033409. The next prime is 21001033433. The reversal of 21001033430 is 3433010012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21001033399 and 21001033408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001033433) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15897170 + ... + 15898490.

It is an arithmetic number, because the mean of its divisors is an integer number (446353470).

Almost surely, 2^21001033430 is an apocalyptic number.

21001033430 is an abundant number, since it is smaller than the sum of its proper divisors (21848899690).

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

21001033430 is a wasteful number, since it uses less digits than its factorization.

21001033430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786 (or 1773 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21001033430 its reverse (3433010012), we get a palindrome (24434043442).

The spelling of 21001033430 in words is "twenty-one billion, one million, thirty-three thousand, four hundred thirty".