121755747021 has 8 divisors (see below), whose sum is σ = 162445133760. Its totient is φ = 81118429152.

The previous prime is 121755746953. The next prime is 121755747077. The reversal of 121755747021 is 120747557121.

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

It is not a de Polignac number, because 121755747021 - 2¹⁰ = 121755745997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121755747221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13011760 + ... + 13021113.

It is an arithmetic number, because the mean of its divisors is an integer number (20305641720).

Almost surely, 2^121755747021 is an apocalyptic number.

It is an amenable number.

121755747021 is a deficient number, since it is larger than the sum of its proper divisors (40689386739).

121755747021 is a wasteful number, since it uses less digits than its factorization.

121755747021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26034435.

The product of its (nonzero) digits is 137200, while the sum is 42.

The spelling of 121755747021 in words is "one hundred twenty-one billion, seven hundred fifty-five million, seven hundred forty-seven thousand, twenty-one".