21011230013221 has 16 divisors (see below), whose sum is σ = 24260666545024. Its totient is φ = 17823755787264.

The previous prime is 21011230013197. The next prime is 21011230013239. The reversal of 21011230013221 is 12231003211012.

It is not a de Polignac number, because 21011230013221 - 2⁷ = 21011230013093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011230014221) 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 15 ways as a sum of consecutive naturals, for example, 107811361 + ... + 108006073.

It is an arithmetic number, because the mean of its divisors is an integer number (1516291659064).

Almost surely, 2^{21011230013221} is an apocalyptic number.

It is an amenable number.

21011230013221 is a deficient number, since it is larger than the sum of its proper divisors (3249436531803).

21011230013221 is a wasteful number, since it uses less digits than its factorization.

21011230013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353740.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21011230013221 its reverse (12231003211012), we get a palindrome (33242233224233).

The spelling of 21011230013221 in words is "twenty-one trillion, eleven billion, two hundred thirty million, thirteen thousand, two hundred twenty-one".