7221106021 has 4 divisors (see below), whose sum is σ = 7223083200. Its totient is φ = 7219128844.

The previous prime is 7221106019. The next prime is 7221106037. The reversal of 7221106021 is 1206011227.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1206011227 = 4073 ⋅296099.

It is a cyclic number.

It is not a de Polignac number, because 7221106021 - 2¹ = 7221106019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7221105983 and 7221106001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221106421) 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, 983101 + ... + 990418.

It is an arithmetic number, because the mean of its divisors is an integer number (1805770800).

Almost surely, 2^7221106021 is an apocalyptic number.

It is an amenable number.

7221106021 is a deficient number, since it is larger than the sum of its proper divisors (1977179).

7221106021 is a wasteful number, since it uses less digits than its factorization.

7221106021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977178.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 7221106021 is about 84977.0911540281. The cubic root of 7221106021 is about 1932.8637469868.

Adding to 7221106021 its reverse (1206011227), we get a palindrome (8427117248).

The spelling of 7221106021 in words is "seven billion, two hundred twenty-one million, one hundred six thousand, twenty-one".