21064625430 has 64 divisors (see below), whose sum is σ = 52108835328. Its totient is φ = 5446506240.

The previous prime is 21064625423. The next prime is 21064625431. The reversal of 21064625430 is 3452646012.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21064625391 and 21064625400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21064625431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117135 + ... + 236325.

It is an arithmetic number, because the mean of its divisors is an integer number (814200552).

Almost surely, 2^21064625430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21064625430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26054417664).

21064625430 is an abundant number, since it is smaller than the sum of its proper divisors (31044209898).

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

21064625430 is a wasteful number, since it uses less digits than its factorization.

21064625430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119381.

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 21064625430 in words is "twenty-one billion, sixty-four million, six hundred twenty-five thousand, four hundred thirty".