7101520221 has 4 divisors (see below), whose sum is σ = 9468693632. Its totient is φ = 4734346812.

The previous prime is 7101520193. The next prime is 7101520229. The reversal of 7101520221 is 1220251017.

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 not a de Polignac number, because 7101520221 - 2⁷ = 7101520093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7101520229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1183586701 + ... + 1183586706.

It is an arithmetic number, because the mean of its divisors is an integer number (2367173408).

Almost surely, 2^7101520221 is an apocalyptic number.

It is an amenable number.

7101520221 is a deficient number, since it is larger than the sum of its proper divisors (2367173411).

7101520221 is a wasteful number, since it uses less digits than its factorization.

7101520221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2367173410.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 7101520221 is about 84270.5181009349. The cubic root of 7101520221 is about 1922.1345095450.

Adding to 7101520221 its reverse (1220251017), we get a palindrome (8321771238).

The spelling of 7101520221 in words is "seven billion, one hundred one million, five hundred twenty thousand, two hundred twenty-one".