21120221202203 has 4 divisors (see below), whose sum is σ = 21120255259488. Its totient is φ = 21120187144920.

The previous prime is 21120221202193. The next prime is 21120221202211. The reversal of 21120221202203 is 30220212202112.

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-21120221202203 is a prime.

It is a super-2 number, since 2×21120221202203² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120221202233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16080851 + ... + 17344572.

It is an arithmetic number, because the mean of its divisors is an integer number (5280063814872).

Almost surely, 2^{21120221202203} is an apocalyptic number.

21120221202203 is a deficient number, since it is larger than the sum of its proper divisors (34057285).

21120221202203 is an equidigital number, since it uses as much as digits as its factorization.

21120221202203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34057284.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21120221202203 its reverse (30220212202112), we get a palindrome (51340433404315).

Subtracting 21120221202203 from its reverse (30220212202112), we obtain a palindrome (9099990999909).

The spelling of 21120221202203 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, two hundred two thousand, two hundred three".