21003013211 has 4 divisors (see below), whose sum is σ = 21003409152. Its totient is φ = 21002617272.

The previous prime is 21003013189. The next prime is 21003013219. The reversal of 21003013211 is 11231030012.

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 21003013211 - 2²⁶ = 20935904347 is a prime.

It is a super-2 number, since 2×21003013211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003013219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103316 + ... + 229521.

It is an arithmetic number, because the mean of its divisors is an integer number (5250852288).

Almost surely, 2^21003013211 is an apocalyptic number.

21003013211 is a deficient number, since it is larger than the sum of its proper divisors (395941).

21003013211 is an equidigital number, since it uses as much as digits as its factorization.

21003013211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395940.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21003013211 its reverse (11231030012), we get a palindrome (32234043223).

The spelling of 21003013211 in words is "twenty-one billion, three million, thirteen thousand, two hundred eleven".