21302153643 has 32 divisors (see below), whose sum is σ = 29617588224. Its totient is φ = 13608000000.

The previous prime is 21302153641. The next prime is 21302153647. The reversal of 21302153643 is 34635120312.

It is not a de Polignac number, because 21302153643 - 2¹ = 21302153641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21302153643.

It is not an unprimeable number, because it can be changed into a prime (21302153641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2362143 + ... + 2371143.

It is an arithmetic number, because the mean of its divisors is an integer number (925549632).

Almost surely, 2^21302153643 is an apocalyptic number.

21302153643 is a deficient number, since it is larger than the sum of its proper divisors (8315434581).

21302153643 is a wasteful number, since it uses less digits than its factorization.

21302153643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9387.

The product of its (nonzero) digits is 12960, while the sum is 30.

Adding to 21302153643 its reverse (34635120312), we get a palindrome (55937273955).

The spelling of 21302153643 in words is "twenty-one billion, three hundred two million, one hundred fifty-three thousand, six hundred forty-three".