21221046363 has 16 divisors (see below), whose sum is σ = 32491555200. Its totient is φ = 12184332480.

The previous prime is 21221046349. The next prime is 21221046383. The reversal of 21221046363 is 36364012212.

It is not a de Polignac number, because 21221046363 - 2⁸ = 21221046107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221046363.

It is not an unprimeable number, because it can be changed into a prime (21221046313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16922058 + ... + 16923311.

It is an arithmetic number, because the mean of its divisors is an integer number (2030722200).

Almost surely, 2^21221046363 is an apocalyptic number.

21221046363 is a deficient number, since it is larger than the sum of its proper divisors (11270508837).

21221046363 is a wasteful number, since it uses less digits than its factorization.

21221046363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33845402.

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 21221046363 its reverse (36364012212), we get a palindrome (57585058575).

The spelling of 21221046363 in words is "twenty-one billion, two hundred twenty-one million, forty-six thousand, three hundred sixty-three".