1225645110521 has 16 divisors (see below), whose sum is σ = 1348082824704. Its totient is φ = 1107232507584.

The previous prime is 1225645110493. The next prime is 1225645110583. The reversal of 1225645110521 is 1250115465221.

It is a cyclic number.

It is not a de Polignac number, because 1225645110521 - 2¹⁰ = 1225645109497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225645110821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14097035 + ... + 14183711.

It is an arithmetic number, because the mean of its divisors is an integer number (84255176544).

Almost surely, 2^{1225645110521} is an apocalyptic number.

It is an amenable number.

1225645110521 is a deficient number, since it is larger than the sum of its proper divisors (122437714183).

1225645110521 is a wasteful number, since it uses less digits than its factorization.

1225645110521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109880.

The product of its (nonzero) digits is 24000, while the sum is 35.

The spelling of 1225645110521 in words is "one trillion, two hundred twenty-five billion, six hundred forty-five million, one hundred ten thousand, five hundred twenty-one".