21221002213303 has 4 divisors (see below), whose sum is σ = 21256788052368. Its totient is φ = 21185216374240.

The previous prime is 21221002213291. The next prime is 21221002213337. The reversal of 21221002213303 is 30331220012212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221002213303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221002213343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17892918643 + ... + 17892919828.

It is an arithmetic number, because the mean of its divisors is an integer number (5314197013092).

Almost surely, 2^{21221002213303} is an apocalyptic number.

21221002213303 is a deficient number, since it is larger than the sum of its proper divisors (35785839065).

21221002213303 is an equidigital number, since it uses as much as digits as its factorization.

21221002213303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35785839064.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21221002213303 its reverse (30331220012212), we get a palindrome (51552222225515).

The spelling of 21221002213303 in words is "twenty-one trillion, two hundred twenty-one billion, two million, two hundred thirteen thousand, three hundred three".