121761304651 has 16 divisors (see below), whose sum is σ = 144678123520. Its totient is φ = 100273515840.

The previous prime is 121761304631. The next prime is 121761304673. The reversal of 121761304651 is 156403167121.

It is a cyclic number.

It is not a de Polignac number, because 121761304651 - 2⁷ = 121761304523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121761304651.

It is not an unprimeable number, because it can be changed into a prime (121761304631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1988226 + ... + 2048551.

It is an arithmetic number, because the mean of its divisors is an integer number (9042382720).

Almost surely, 2^121761304651 is an apocalyptic number.

121761304651 is a deficient number, since it is larger than the sum of its proper divisors (22916818869).

121761304651 is a wasteful number, since it uses less digits than its factorization.

121761304651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4036954.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 121761304651 in words is "one hundred twenty-one billion, seven hundred sixty-one million, three hundred four thousand, six hundred fifty-one".