12321017554 has 16 divisors (see below), whose sum is σ = 18799957440. Its totient is φ = 6054422800.

The previous prime is 12321017551. The next prime is 12321017561. The reversal of 12321017554 is 45571012321.

It is a super-2 number, since 2×12321017554² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12321017551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489579 + ... + 514129.

It is an arithmetic number, because the mean of its divisors is an integer number (1174997340).

Almost surely, 2^12321017554 is an apocalyptic number.

12321017554 is a deficient number, since it is larger than the sum of its proper divisors (6478939886).

12321017554 is a wasteful number, since it uses less digits than its factorization.

12321017554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28865.

The product of its (nonzero) digits is 8400, while the sum is 31.

Adding to 12321017554 its reverse (45571012321), we get a palindrome (57892029875).

The spelling of 12321017554 in words is "twelve billion, three hundred twenty-one million, seventeen thousand, five hundred fifty-four".