121701356778 has 8 divisors (see below), whose sum is σ = 243402713568. Its totient is φ = 40567118924.

The previous prime is 121701356767. The next prime is 121701356809. The reversal of 121701356778 is 877653107121.

It is a sphenic number, since it is the product of 3 distinct primes.

121701356778 is an admirable number.

It is a super-2 number, since 2×121701356778² (a number of 23 digits) contains 22 as substring.

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, 10141779726 + ... + 10141779737.

It is an arithmetic number, because the mean of its divisors is an integer number (30425339196).

Almost surely, 2^121701356778 is an apocalyptic number.

121701356778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

121701356778 is a wasteful number, since it uses less digits than its factorization.

121701356778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20283559468.

The product of its (nonzero) digits is 493920, while the sum is 48.

The spelling of 121701356778 in words is "one hundred twenty-one billion, seven hundred one million, three hundred fifty-six thousand, seven hundred seventy-eight".