1221233225563 has 16 divisors (see below), whose sum is σ = 1318782679200. Its totient is φ = 1124200915200.

The previous prime is 1221233225551. The next prime is 1221233225579. The reversal of 1221233225563 is 3655223321221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221233225563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221233225063) 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, 18784413 + ... + 18849313.

It is an arithmetic number, because the mean of its divisors is an integer number (82423917450).

Almost surely, 2^{1221233225563} is an apocalyptic number.

1221233225563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221233225563 is a deficient number, since it is larger than the sum of its proper divisors (97549453637).

1221233225563 is a wasteful number, since it uses less digits than its factorization.

1221233225563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68862.

The product of its digits is 129600, while the sum is 37.

Adding to 1221233225563 its reverse (3655223321221), we get a palindrome (4876456546784).

The spelling of 1221233225563 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-three million, two hundred twenty-five thousand, five hundred sixty-three".