21224211033021 has 16 divisors (see below), whose sum is σ = 28422849994560. Its totient is φ = 14087524464000.

The previous prime is 21224211033019. The next prime is 21224211033023. The reversal of 21224211033021 is 12033011242212.

It is an interprime number because it is at equal distance from previous prime (21224211033019) and next prime (21224211033023).

It is not a de Polignac number, because 21224211033021 - 2¹ = 21224211033019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21224211032982 and 21224211033000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224211033023) 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, 106958146 + ... + 107156396.

It is an arithmetic number, because the mean of its divisors is an integer number (1776428124660).

Almost surely, 2^{21224211033021} is an apocalyptic number.

It is an amenable number.

21224211033021 is a deficient number, since it is larger than the sum of its proper divisors (7198638961539).

21224211033021 is a wasteful number, since it uses less digits than its factorization.

21224211033021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354316.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21224211033021 its reverse (12033011242212), we get a palindrome (33257222275233).

The spelling of 21224211033021 in words is "twenty-one trillion, two hundred twenty-four billion, two hundred eleven million, thirty-three thousand, twenty-one".