121381553712 has 30 divisors (see below), whose sum is σ = 313575249468. Its totient is φ = 40459713312.

The previous prime is 121381553653. The next prime is 121381553723. The reversal of 121381553712 is 217355183121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2388633 + ... + 2438919.

Almost surely, 2^121381553712 is an apocalyptic number.

121381553712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121381553712 is an abundant number, since it is smaller than the sum of its proper divisors (192193695756).

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

121381553712 is an frugal number, since it uses more digits than its factorization.

121381553712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100585 (or 50292 counting only the distinct ones).

The product of its digits is 50400, while the sum is 39.

The spelling of 121381553712 in words is "one hundred twenty-one billion, three hundred eighty-one million, five hundred fifty-three thousand, seven hundred twelve".