21110212010221 has 4 divisors (see below), whose sum is σ = 21114723708000. Its totient is φ = 21105700312444.

The previous prime is 21110212010219. The next prime is 21110212010291. The reversal of 21110212010221 is 12201021201112.

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 21110212010221 - 2¹ = 21110212010219 is a prime.

It is a super-2 number, since 2×21110212010221² (a number of 27 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 = 21110212010195 and 21110212010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110212010291) 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, 2255841871 + ... + 2255851228.

It is an arithmetic number, because the mean of its divisors is an integer number (5278680927000).

Almost surely, 2^{21110212010221} is an apocalyptic number.

It is an amenable number.

21110212010221 is a deficient number, since it is larger than the sum of its proper divisors (4511697779).

21110212010221 is an equidigital number, since it uses as much as digits as its factorization.

21110212010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511697778.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21110212010221 its reverse (12201021201112), we get a palindrome (33311233211333).

The spelling of 21110212010221 in words is "twenty-one trillion, one hundred ten billion, two hundred twelve million, ten thousand, two hundred twenty-one".