7421100221 has 4 divisors (see below), whose sum is σ = 7421383932. Its totient is φ = 7420816512.

The previous prime is 7421100217. The next prime is 7421100233. The reversal of 7421100221 is 1220011247.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1522092196 + 5899008025 = 39014^2 + 76805^2 .

It is a cyclic number.

It is not a de Polignac number, because 7421100221 - 2² = 7421100217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7421100193 and 7421100202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7421106221) 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, 98126 + ... + 156431.

It is an arithmetic number, because the mean of its divisors is an integer number (1855345983).

Almost surely, 2^7421100221 is an apocalyptic number.

It is an amenable number.

7421100221 is a deficient number, since it is larger than the sum of its proper divisors (283711).

7421100221 is a wasteful number, since it uses less digits than its factorization.

7421100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283710.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 7421100221 is about 86145.8079130958. The cubic root of 7421100221 is about 1950.5455603477.

Adding to 7421100221 its reverse (1220011247), we get a palindrome (8641111468).

The spelling of 7421100221 in words is "seven billion, four hundred twenty-one million, one hundred thousand, two hundred twenty-one".