121921547786 has 8 divisors (see below), whose sum is σ = 186332931684. Its totient is φ = 59810570560.

The previous prime is 121921547753. The next prime is 121921547831. The reversal of 121921547786 is 687745129121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 120773625625 + 1147922161 = 347525^2 + 33881^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575101535 + ... + 575101746.

Almost surely, 2^121921547786 is an apocalyptic number.

121921547786 is a deficient number, since it is larger than the sum of its proper divisors (64411383898).

121921547786 is a wasteful number, since it uses less digits than its factorization.

121921547786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150203336.

The product of its digits is 1693440, while the sum is 53.

The spelling of 121921547786 in words is "one hundred twenty-one billion, nine hundred twenty-one million, five hundred forty-seven thousand, seven hundred eighty-six".