12251220465 has 32 divisors (see below), whose sum is σ = 21393072000. Its totient is φ = 5937451520.

The previous prime is 12251220451. The next prime is 12251220467. The reversal of 12251220465 is 56402215221.

It is not a de Polignac number, because 12251220465 - 2⁷ = 12251220337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12251220467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 406021 + ... + 435149.

It is an arithmetic number, because the mean of its divisors is an integer number (668533500).

Almost surely, 2^12251220465 is an apocalyptic number.

12251220465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12251220465 is a deficient number, since it is larger than the sum of its proper divisors (9141851535).

12251220465 is a wasteful number, since it uses less digits than its factorization.

12251220465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31697.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 12251220465 its reverse (56402215221), we get a palindrome (68653435686).

The spelling of 12251220465 in words is "twelve billion, two hundred fifty-one million, two hundred twenty thousand, four hundred sixty-five".