21003221011 has 8 divisors (see below), whose sum is σ = 21175569920. Its totient is φ = 20830981248.

The previous prime is 21003220993. The next prime is 21003221027. The reversal of 21003221011 is 11012230012.

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 21003221011 - 2⁷ = 21003220883 is a prime.

It is a super-2 number, since 2×21003221011² (a number of 21 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 = 21003220982 and 21003221000.

It is not an unprimeable number, because it can be changed into a prime (21003221411) 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, 384475 + ... + 435691.

It is an arithmetic number, because the mean of its divisors is an integer number (2646946240).

Almost surely, 2^21003221011 is an apocalyptic number.

21003221011 is a deficient number, since it is larger than the sum of its proper divisors (172348909).

21003221011 is a wasteful number, since it uses less digits than its factorization.

21003221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54573.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21003221011 its reverse (11012230012), we get a palindrome (32015451023).

Subtracting from 21003221011 its reverse (11012230012), we obtain a palindrome (9990990999).

The spelling of 21003221011 in words is "twenty-one billion, three million, two hundred twenty-one thousand, eleven".