7211197442 has 4 divisors (see below), whose sum is σ = 10816796166. Its totient is φ = 3605598720.

The previous prime is 7211197439. The next prime is 7211197447. The reversal of 7211197442 is 2447911127.

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

It can be written as a sum of positive squares in only one way, i.e., 5656393681 + 1554803761 = 75209^2 + 39431^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7211197396 and 7211197405.

It is not an unprimeable number, because it can be changed into a prime (7211197447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1802799359 + ... + 1802799362.

Almost surely, 2^7211197442 is an apocalyptic number.

7211197442 is a deficient number, since it is larger than the sum of its proper divisors (3605598724).

7211197442 is a wasteful number, since it uses less digits than its factorization.

7211197442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3605598723.

The product of its digits is 28224, while the sum is 38.

The square root of 7211197442 is about 84918.7696684308. The cubic root of 7211197442 is about 1931.9792703033.

The spelling of 7211197442 in words is "seven billion, two hundred eleven million, one hundred ninety-seven thousand, four hundred forty-two".