121426556088551 has 20 divisors (see below), whose sum is σ = 142274471850600. Its totient is φ = 103625407346832.

The previous prime is 121426556088529. The next prime is 121426556088569. The reversal of 121426556088551 is 155880655624121.

It is not a de Polignac number, because 121426556088551 - 2¹⁰ = 121426556087527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121426556088581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 109872281 + ... + 110971938.

It is an arithmetic number, because the mean of its divisors is an integer number (7113723592530).

Almost surely, 2^{121426556088551} is an apocalyptic number.

121426556088551 is a deficient number, since it is larger than the sum of its proper divisors (20847915762049).

121426556088551 is an frugal number, since it uses more digits than its factorization.

121426556088551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220844476 (or 220844455 counting only the distinct ones).

The product of its (nonzero) digits is 23040000, while the sum is 59.

The spelling of 121426556088551 in words is "one hundred twenty-one trillion, four hundred twenty-six billion, five hundred fifty-six million, eighty-eight thousand, five hundred fifty-one".