121358739612 has 96 divisors (see below), whose sum is σ = 320273049600. Its totient is φ = 35433388800.

The previous prime is 121358739571. The next prime is 121358739617. The reversal of 121358739612 is 216937853121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121358739617) 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, 872314 + ... + 1001822.

It is an arithmetic number, because the mean of its divisors is an integer number (3336177600).

Almost surely, 2^121358739612 is an apocalyptic number.

121358739612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121358739612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160136524800).

121358739612 is an abundant number, since it is smaller than the sum of its proper divisors (198914309988).

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

121358739612 is a wasteful number, since it uses less digits than its factorization.

121358739612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129787 (or 129785 counting only the distinct ones).

The product of its digits is 544320, while the sum is 48.

The spelling of 121358739612 in words is "one hundred twenty-one billion, three hundred fifty-eight million, seven hundred thirty-nine thousand, six hundred twelve".