21110011311221 has 4 divisors (see below), whose sum is σ = 24125727212832. Its totient is φ = 18094295409612.

The previous prime is 21110011311217. The next prime is 21110011311239. The reversal of 21110011311221 is 12211311001112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21110011311221 - 2² = 21110011311217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21110011311221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110011371221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507857950795 + ... + 1507857950808.

It is an arithmetic number, because the mean of its divisors is an integer number (6031431803208).

Almost surely, 2^{21110011311221} is an apocalyptic number.

It is an amenable number.

21110011311221 is a deficient number, since it is larger than the sum of its proper divisors (3015715901611).

21110011311221 is an equidigital number, since it uses as much as digits as its factorization.

21110011311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015715901610.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 21110011311221 its reverse (12211311001112), we get a palindrome (33321322312333).

The spelling of 21110011311221 in words is "twenty-one trillion, one hundred ten billion, eleven million, three hundred eleven thousand, two hundred twenty-one".