7221212212 has 6 divisors (see below), whose sum is σ = 12637121378. Its totient is φ = 3610606104.

The previous prime is 7221212197. The next prime is 7221212237. The reversal of 7221212212 is 2122121227.

It can be written as a sum of positive squares in only one way, i.e., 6142483876 + 1078728336 = 78374^2 + 32844^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902651523 + ... + 902651530.

Almost surely, 2^7221212212 is an apocalyptic number.

It is an amenable number.

7221212212 is a deficient number, since it is larger than the sum of its proper divisors (5415909166).

7221212212 is a wasteful number, since it uses less digits than its factorization.

7221212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805303057 (or 1805303055 counting only the distinct ones).

The product of its digits is 448, while the sum is 22.

The square root of 7221212212 is about 84977.7159730714. The cubic root of 7221212212 is about 1932.8732216078.

Adding to 7221212212 its reverse (2122121227), we get a palindrome (9343333439).

The spelling of 7221212212 in words is "seven billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twelve".