21121211202203 has 8 divisors (see below), whose sum is σ = 24201551966208. Its totient is φ = 18056626657704.

The previous prime is 21121211202193. The next prime is 21121211202229. The reversal of 21121211202203 is 30220211212112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21121211202203 - 2⁸ = 21121211201947 is a prime.

It is a super-2 number, since 2×21121211202203² (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 (21121211202263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3939052001 + ... + 3939057362.

It is an arithmetic number, because the mean of its divisors is an integer number (3025193995776).

Almost surely, 2^{21121211202203} is an apocalyptic number.

21121211202203 is a deficient number, since it is larger than the sum of its proper divisors (3080340764005).

21121211202203 is an equidigital number, since it uses as much as digits as its factorization.

21121211202203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7878109753.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21121211202203 its reverse (30220211212112), we get a palindrome (51341422414315).

Subtracting 21121211202203 from its reverse (30220211212112), we obtain a palindrome (9099000009909).

The spelling of 21121211202203 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, two hundred two thousand, two hundred three".