121709728941 has 4 divisors (see below), whose sum is σ = 162279638592. Its totient is φ = 81139819292.

The previous prime is 121709728927. The next prime is 121709728963. The reversal of 121709728941 is 149827907121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121709728941 - 2¹⁹ = 121709204653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121709728541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20284954821 + ... + 20284954826.

It is an arithmetic number, because the mean of its divisors is an integer number (40569909648).

Almost surely, 2^121709728941 is an apocalyptic number.

It is an amenable number.

121709728941 is a deficient number, since it is larger than the sum of its proper divisors (40569909651).

121709728941 is an equidigital number, since it uses as much as digits as its factorization.

121709728941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40569909650.

The product of its (nonzero) digits is 508032, while the sum is 51.

The spelling of 121709728941 in words is "one hundred twenty-one billion, seven hundred nine million, seven hundred twenty-eight thousand, nine hundred forty-one".