21105041352 has 16 divisors (see below), whose sum is σ = 52762603440. Its totient is φ = 7035013776.

The previous prime is 21105041329. The next prime is 21105041371. The reversal of 21105041352 is 25314050112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 879376723 = 21105041352 / (2 + 1 + 1 + 0 + 5 + 0 + 4 + 1 + 3 + 5 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439688338 + ... + 439688385.

It is an arithmetic number, because the mean of its divisors is an integer number (3297662715).

Almost surely, 2^21105041352 is an apocalyptic number.

It is an amenable number.

21105041352 is an abundant number, since it is smaller than the sum of its proper divisors (31657562088).

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

21105041352 is a wasteful number, since it uses less digits than its factorization.

21105041352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879376732 (or 879376728 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21105041352 its reverse (25314050112), we get a palindrome (46419091464).

The spelling of 21105041352 in words is "twenty-one billion, one hundred five million, forty-one thousand, three hundred fifty-two".