121551112235454 has 96 divisors (see below), whose sum is σ = 271266870309120. Its totient is φ = 36275781696000.

The previous prime is 121551112235429. The next prime is 121551112235533. The reversal of 121551112235454 is 454532211155121.

It is a super-2 number, since 2×121551112235454² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46617069 + ... + 49155399.

It is an arithmetic number, because the mean of its divisors is an integer number (2825696565720).

Almost surely, 2^{121551112235454} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121551112235454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135633435154560).

121551112235454 is an abundant number, since it is smaller than the sum of its proper divisors (149715758073666).

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

121551112235454 is a wasteful number, since it uses less digits than its factorization.

121551112235454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2539358 (or 2539347 counting only the distinct ones).

The product of its digits is 240000, while the sum is 42.

The spelling of 121551112235454 in words is "one hundred twenty-one trillion, five hundred fifty-one billion, one hundred twelve million, two hundred thirty-five thousand, four hundred fifty-four".