1211221111048 has 32 divisors (see below), whose sum is σ = 2511835887960. Its totient is φ = 543916339200.

The previous prime is 1211221110919. The next prime is 1211221111049. The reversal of 1211221111048 is 8401111221121.

It can be written as a sum of positive squares in 4 ways, for example, as 1178922551524 + 32298559524 = 1085782^2 + 179718^2 .

It is not an unprimeable number, because it can be changed into a prime (1211221111049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157379353 + ... + 157387048.

Almost surely, 2^{1211221111048} is an apocalyptic number.

It is an amenable number.

1211221111048 is an abundant number, since it is smaller than the sum of its proper divisors (1300614776912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211221111048 is a wasteful number, since it uses less digits than its factorization.

1211221111048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314766457 (or 314766453 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 25.

Adding to 1211221111048 its reverse (8401111221121), we get a palindrome (9612332332169).

The spelling of 1211221111048 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, forty-eight".