121957744011 has 4 divisors (see below), whose sum is σ = 162610325352. Its totient is φ = 81305162672.

The previous prime is 121957743979. The next prime is 121957744039. The reversal of 121957744011 is 110447759121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121957744011 - 2⁵ = 121957743979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121957744061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20326290666 + ... + 20326290671.

It is an arithmetic number, because the mean of its divisors is an integer number (40652581338).

Almost surely, 2^121957744011 is an apocalyptic number.

121957744011 is a deficient number, since it is larger than the sum of its proper divisors (40652581341).

121957744011 is an equidigital number, since it uses as much as digits as its factorization.

121957744011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40652581340.

The product of its (nonzero) digits is 70560, while the sum is 42.

The spelling of 121957744011 in words is "one hundred twenty-one billion, nine hundred fifty-seven million, seven hundred forty-four thousand, eleven".