12102321520 has 40 divisors (see below), whose sum is σ = 28155813984. Its totient is φ = 4837846272.

The previous prime is 12102321463. The next prime is 12102321599. The reversal of 12102321520 is 2512320121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×12102321520² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80397 + ... + 175123.

Almost surely, 2^12102321520 is an apocalyptic number.

12102321520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12102321520 is an abundant number, since it is smaller than the sum of its proper divisors (16053492464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12102321520 is a wasteful number, since it uses less digits than its factorization.

12102321520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96337 (or 96331 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 12102321520 its reverse (2512320121), we get a palindrome (14614641641).

The spelling of 12102321520 in words is "twelve billion, one hundred two million, three hundred twenty-one thousand, five hundred twenty".