1221113320525 has 48 divisors (see below), whose sum is σ = 1891391800320. Its totient is φ = 762657868800.

The previous prime is 1221113320507. The next prime is 1221113320541. The reversal of 1221113320525 is 5250233111221.

It is not a de Polignac number, because 1221113320525 - 2⁹ = 1221113320013 is a prime.

It is a super-2 number, since 2×1221113320525² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221113320493 and 1221113320502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6528070 + ... + 6712519.

It is an arithmetic number, because the mean of its divisors is an integer number (39403995840).

Almost surely, 2^{1221113320525} is an apocalyptic number.

It is an amenable number.

1221113320525 is a deficient number, since it is larger than the sum of its proper divisors (670278479795).

1221113320525 is a wasteful number, since it uses less digits than its factorization.

1221113320525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13240654 (or 13240649 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 1221113320525 its reverse (5250233111221), we get a palindrome (6471346431746).

The spelling of 1221113320525 in words is "one trillion, two hundred twenty-one billion, one hundred thirteen million, three hundred twenty thousand, five hundred twenty-five".