121510221312 has 40 divisors (see below), whose sum is σ = 323710828056. Its totient is φ = 40503406592.

The previous prime is 121510221307. The next prime is 121510221337. The reversal of 121510221312 is 213122015121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39552573 + ... + 39555644.

Almost surely, 2^121510221312 is an apocalyptic number.

121510221312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121510221312 is an abundant number, since it is smaller than the sum of its proper divisors (202200606744).

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

121510221312 is an frugal number, since it uses more digits than its factorization.

121510221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79108238 (or 79108222 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 121510221312 its reverse (213122015121), we get a palindrome (334632236433).

The spelling of 121510221312 in words is "one hundred twenty-one billion, five hundred ten million, two hundred twenty-one thousand, three hundred twelve".