21305140626 has 64 divisors (see below), whose sum is σ = 55434295296. Its totient is φ = 5293200000.

The previous prime is 21305140601. The next prime is 21305140663. The reversal of 21305140626 is 62604150312.

It is a junction number, because it is equal to n+sod(n) for n = 21305140593 and 21305140602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 991875 + ... + 1013126.

It is an arithmetic number, because the mean of its divisors is an integer number (866160864).

Almost surely, 2^21305140626 is an apocalyptic number.

21305140626 is an abundant number, since it is smaller than the sum of its proper divisors (34129154670).

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

21305140626 is a wasteful number, since it uses less digits than its factorization.

21305140626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005047.

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

Adding to 21305140626 its reverse (62604150312), we get a palindrome (83909290938).

The spelling of 21305140626 in words is "twenty-one billion, three hundred five million, one hundred forty thousand, six hundred twenty-six".