1211000221012 has 12 divisors (see below), whose sum is σ = 2124698333940. Its totient is φ = 603943554176.

The previous prime is 1211000221009. The next prime is 1211000221021. The reversal of 1211000221012 is 2101220001121.

It can be written as a sum of positive squares in 2 ways, for example, as 831955597456 + 379044623556 = 912116^2 + 615666^2 .

It is a super-2 number, since 2×1211000221012² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211000220983 and 1211000221001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389137333 + ... + 389140444.

It is an arithmetic number, because the mean of its divisors is an integer number (177058194495).

Almost surely, 2^{1211000221012} is an apocalyptic number.

It is an amenable number.

1211000221012 is a deficient number, since it is larger than the sum of its proper divisors (913698112928).

1211000221012 is a wasteful number, since it uses less digits than its factorization.

1211000221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778278170 (or 778278168 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1211000221012 its reverse (2101220001121), we get a palindrome (3312220222133).

The spelling of 1211000221012 in words is "one trillion, two hundred eleven billion, two hundred twenty-one thousand, twelve".