21201021210203 has 4 divisors (see below), whose sum is σ = 21201880584768. Its totient is φ = 21200161835640.

The previous prime is 21201021210167. The next prime is 21201021210221. The reversal of 21201021210203 is 30201212010212.

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 21201021210203 - 2⁸ = 21201021209947 is a prime.

It is a super-2 number, since 2×21201021210203² (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 (21201021210253) 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, 429650276 + ... + 429699617.

It is an arithmetic number, because the mean of its divisors is an integer number (5300470146192).

Almost surely, 2^{21201021210203} is an apocalyptic number.

21201021210203 is a deficient number, since it is larger than the sum of its proper divisors (859374565).

21201021210203 is an equidigital number, since it uses as much as digits as its factorization.

21201021210203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859374564.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21201021210203 its reverse (30201212010212), we get a palindrome (51402233220415).

The spelling of 21201021210203 in words is "twenty-one trillion, two hundred one billion, twenty-one million, two hundred ten thousand, two hundred three".