21452004430 has 16 divisors (see below), whose sum is σ = 38635666704. Its totient is φ = 8575899840.

The previous prime is 21452004419. The next prime is 21452004463. The reversal of 21452004430 is 3440025412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21452004395 and 21452004404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594336 + ... + 629395.

It is an arithmetic number, because the mean of its divisors is an integer number (2414729169).

Almost surely, 2^21452004430 is an apocalyptic number.

21452004430 is a deficient number, since it is larger than the sum of its proper divisors (17183662274).

21452004430 is a wasteful number, since it uses less digits than its factorization.

21452004430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225491.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21452004430 its reverse (3440025412), we get a palindrome (24892029842).

The spelling of 21452004430 in words is "twenty-one billion, four hundred fifty-two million, four thousand, four hundred thirty".