21003002211031 has 4 divisors (see below), whose sum is σ = 21003343546192. Its totient is φ = 21002660875872.

The previous prime is 21003002211007. The next prime is 21003002211073. The reversal of 21003002211031 is 13011220030012.

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 21003002211031 - 2²³ = 21002993822423 is a prime.

It is a super-2 number, since 2×21003002211031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21003002210996 and 21003002211014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003002211091) 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, 170575266 + ... + 170698351.

It is an arithmetic number, because the mean of its divisors is an integer number (5250835886548).

Almost surely, 2^{21003002211031} is an apocalyptic number.

21003002211031 is a deficient number, since it is larger than the sum of its proper divisors (341335161).

21003002211031 is an equidigital number, since it uses as much as digits as its factorization.

21003002211031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341335160.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21003002211031 its reverse (13011220030012), we get a palindrome (34014222241043).

The spelling of 21003002211031 in words is "twenty-one trillion, three billion, two million, two hundred eleven thousand, thirty-one".