1211222131552 has 24 divisors (see below), whose sum is σ = 2386533920400. Its totient is φ = 605118278784.

The previous prime is 1211222131547. The next prime is 1211222131583. The reversal of 1211222131552 is 2551312221121.

It is a super-2 number, since 2×1211222131552² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211222131552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15359652 + ... + 15438307.

It is an arithmetic number, because the mean of its divisors is an integer number (99438913350).

Almost surely, 2^{1211222131552} is an apocalyptic number.

It is an amenable number.

1211222131552 is a deficient number, since it is larger than the sum of its proper divisors (1175311788848).

1211222131552 is a wasteful number, since it uses less digits than its factorization.

1211222131552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30799198 (or 30799190 counting only the distinct ones).

The product of its digits is 2400, while the sum is 28.

Adding to 1211222131552 its reverse (2551312221121), we get a palindrome (3762534352673).

The spelling of 1211222131552 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred thirty-one thousand, five hundred fifty-two".