21210221121203 has 4 divisors (see below), whose sum is σ = 21210435272520. Its totient is φ = 21210006969888.

The previous prime is 21210221121191. The next prime is 21210221121209. The reversal of 21210221121203 is 30212112201212.

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

It is a cyclic number.

It is not a de Polignac number, because 21210221121203 - 2²⁶ = 21210154012339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210221121209) 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, 106927025 + ... + 107125202.

It is an arithmetic number, because the mean of its divisors is an integer number (5302608818130).

Almost surely, 2^{21210221121203} is an apocalyptic number.

21210221121203 is a deficient number, since it is larger than the sum of its proper divisors (214151317).

21210221121203 is an equidigital number, since it uses as much as digits as its factorization.

21210221121203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214151316.

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

Adding to 21210221121203 its reverse (30212112201212), we get a palindrome (51422333322415).

The spelling of 21210221121203 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred three".