12445551321 has 32 divisors (see below), whose sum is σ = 19817656320. Its totient is φ = 6792755904.

The previous prime is 12445551317. The next prime is 12445551329. The reversal of 12445551321 is 12315554421.

It is not a de Polignac number, because 12445551321 - 2² = 12445551317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12445551329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 324276 + ... + 360618.

It is an arithmetic number, because the mean of its divisors is an integer number (619301760).

Almost surely, 2^12445551321 is an apocalyptic number.

It is an amenable number.

12445551321 is a deficient number, since it is larger than the sum of its proper divisors (7372104999).

12445551321 is a wasteful number, since it uses less digits than its factorization.

12445551321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37085.

The product of its digits is 24000, while the sum is 33.

The spelling of 12445551321 in words is "twelve billion, four hundred forty-five million, five hundred fifty-one thousand, three hundred twenty-one".