21525430412 has 6 divisors (see below), whose sum is σ = 37669503228. Its totient is φ = 10762715204.

The previous prime is 21525430363. The next prime is 21525430489. The reversal of 21525430412 is 21403452512.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2690678798 + ... + 2690678805.

It is an arithmetic number, because the mean of its divisors is an integer number (6278250538).

Almost surely, 2^21525430412 is an apocalyptic number.

It is an amenable number.

21525430412 is a deficient number, since it is larger than the sum of its proper divisors (16144072816).

21525430412 is a wasteful number, since it uses less digits than its factorization.

21525430412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5381357607 (or 5381357605 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 21525430412 its reverse (21403452512), we get a palindrome (42928882924).

The spelling of 21525430412 in words is "twenty-one billion, five hundred twenty-five million, four hundred thirty thousand, four hundred twelve".