21105310630 has 16 divisors (see below), whose sum is σ = 37991705904. Its totient is φ = 8441647200.

The previous prime is 21105310591. The next prime is 21105310631. The reversal of 21105310630 is 3601350112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105310631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167305 + ... + 264955.

It is an arithmetic number, because the mean of its divisors is an integer number (2374481619).

Almost surely, 2^21105310630 is an apocalyptic number.

21105310630 is a deficient number, since it is larger than the sum of its proper divisors (16886395274).

21105310630 is a wasteful number, since it uses less digits than its factorization.

21105310630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119271.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 21105310630 its reverse (3601350112), we get a palindrome (24706660742).

The spelling of 21105310630 in words is "twenty-one billion, one hundred five million, three hundred ten thousand, six hundred thirty".