21525421030 has 8 divisors (see below), whose sum is σ = 38745757872. Its totient is φ = 8610168408.

The previous prime is 21525421009. The next prime is 21525421039. The reversal of 21525421030 is 3012452512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21525420986 and 21525421004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525421039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076271042 + ... + 1076271061.

It is an arithmetic number, because the mean of its divisors is an integer number (4843219734).

Almost surely, 2^21525421030 is an apocalyptic number.

21525421030 is a deficient number, since it is larger than the sum of its proper divisors (17220336842).

21525421030 is a wasteful number, since it uses less digits than its factorization.

21525421030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152542110.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21525421030 its reverse (3012452512), we get a palindrome (24537873542).

The spelling of 21525421030 in words is "twenty-one billion, five hundred twenty-five million, four hundred twenty-one thousand, thirty".