121423510345554 has 12 divisors (see below), whose sum is σ = 263084272415406. Its totient is φ = 40474503448512.

The previous prime is 121423510345517. The next prime is 121423510345583. The reversal of 121423510345554 is 455543015324121.

121423510345554 is a `hidden beast` number, since 1 + 2 + 1 + 4 + 2 + 3 + 51 + 0 + 3 + 45 + 554 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63257796389529 + 58165713956025 = 7953477^2 + 7626645^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3372875287359 + ... + 3372875287394.

Almost surely, 2^{121423510345554} is an apocalyptic number.

121423510345554 is an abundant number, since it is smaller than the sum of its proper divisors (141660762069852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121423510345554 is a wasteful number, since it uses less digits than its factorization.

121423510345554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6745750574761 (or 6745750574758 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 45.

Adding to 121423510345554 its reverse (455543015324121), we get a palindrome (576966525669675).

The spelling of 121423510345554 in words is "one hundred twenty-one trillion, four hundred twenty-three billion, five hundred ten million, three hundred forty-five thousand, five hundred fifty-four".