21530106426 has 8 divisors (see below), whose sum is σ = 43060212864. Its totient is φ = 7176702140.

The previous prime is 21530106421. The next prime is 21530106449. The reversal of 21530106426 is 62460103512.

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

21530106426 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21530106393 and 21530106402.

It is not an unprimeable number, because it can be changed into a prime (21530106421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1794175530 + ... + 1794175541.

It is an arithmetic number, because the mean of its divisors is an integer number (5382526608).

Almost surely, 2^21530106426 is an apocalyptic number.

21530106426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21530106426 is a wasteful number, since it uses less digits than its factorization.

21530106426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3588351076.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 21530106426 its reverse (62460103512), we get a palindrome (83990209938).

The spelling of 21530106426 in words is "twenty-one billion, five hundred thirty million, one hundred six thousand, four hundred twenty-six".