21320221122203 has 4 divisors (see below), whose sum is σ = 21359197761000. Its totient is φ = 21281244483408.

The previous prime is 21320221122197. The next prime is 21320221122217. The reversal of 21320221122203 is 30222112202312.

It is a happy number.

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-21320221122203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21320221122253) 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, 19488318578 + ... + 19488319671.

It is an arithmetic number, because the mean of its divisors is an integer number (5339799440250).

Almost surely, 2^{21320221122203} is an apocalyptic number.

21320221122203 is a deficient number, since it is larger than the sum of its proper divisors (38976638797).

21320221122203 is an equidigital number, since it uses as much as digits as its factorization.

21320221122203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38976638796.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21320221122203 its reverse (30222112202312), we get a palindrome (51542333324515).

The spelling of 21320221122203 in words is "twenty-one trillion, three hundred twenty billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred three".