21221030311 has 16 divisors (see below), whose sum is σ = 23127396768. Its totient is φ = 19354608000.

The previous prime is 21221030287. The next prime is 21221030371. The reversal of 21221030311 is 11303012212.

It is not a de Polignac number, because 21221030311 - 2¹¹ = 21221028263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221030371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 628225 + ... + 661141.

It is an arithmetic number, because the mean of its divisors is an integer number (1445462298).

Almost surely, 2^21221030311 is an apocalyptic number.

21221030311 is a deficient number, since it is larger than the sum of its proper divisors (1906366457).

21221030311 is a wasteful number, since it uses less digits than its factorization.

21221030311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33522.

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

Adding to 21221030311 its reverse (11303012212), we get a palindrome (32524042523).

The spelling of 21221030311 in words is "twenty-one billion, two hundred twenty-one million, thirty thousand, three hundred eleven".