7211221552 has 20 divisors (see below), whose sum is σ = 14235361200. Its totient is φ = 3537579968.

The previous prime is 7211221469. The next prime is 7211221553. The reversal of 7211221552 is 2551221127.

It is a self number, because there is not a number n which added to its sum of digits gives 7211221552.

It is not an unprimeable number, because it can be changed into a prime (7211221553) 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, 4251052 + ... + 4252747.

It is an arithmetic number, because the mean of its divisors is an integer number (711768060).

Almost surely, 2^7211221552 is an apocalyptic number.

It is an amenable number.

7211221552 is a deficient number, since it is larger than the sum of its proper divisors (7024139648).

7211221552 is a wasteful number, since it uses less digits than its factorization.

7211221552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8503860 (or 8503854 counting only the distinct ones).

The product of its digits is 2800, while the sum is 28.

The square root of 7211221552 is about 84918.9116275050. The cubic root of 7211221552 is about 1931.9814234347.

Adding to 7211221552 its reverse (2551221127), we get a palindrome (9762442679).

The spelling of 7211221552 in words is "seven billion, two hundred eleven million, two hundred twenty-one thousand, five hundred fifty-two".