121556126106 has 24 divisors (see below), whose sum is σ = 264464444244. Its totient is φ = 40350579840.

The previous prime is 121556126063. The next prime is 121556126117. The reversal of 121556126106 is 601621655121.

121556126106 is a `hidden beast` number, since 1 + 21 + 5 + 5 + 6 + 12 + 610 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 120159982881 + 1396143225 = 346641^2 + 37365^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14006281 + ... + 14014956.

Almost surely, 2^121556126106 is an apocalyptic number.

121556126106 is an abundant number, since it is smaller than the sum of its proper divisors (142908318138).

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

121556126106 is a wasteful number, since it uses less digits than its factorization.

121556126106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28021486 (or 28021483 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 121556126106 in words is "one hundred twenty-one billion, five hundred fifty-six million, one hundred twenty-six thousand, one hundred six".