121191138554 has 32 divisors (see below), whose sum is σ = 185607450000. Its totient is φ = 59337552384.

The previous prime is 121191138547. The next prime is 121191138613. The reversal of 121191138554 is 455831191121.

It can be written as a sum of positive squares in 8 ways, for example, as 57271669225 + 63919469329 = 239315^2 + 252823^2 .

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 15 ways as a sum of consecutive naturals, for example, 9249632 + ... + 9262724.

Almost surely, 2^121191138554 is an apocalyptic number.

121191138554 is a deficient number, since it is larger than the sum of its proper divisors (64416311446).

121191138554 is a wasteful number, since it uses less digits than its factorization.

121191138554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13682.

The product of its digits is 43200, while the sum is 41.

The spelling of 121191138554 in words is "one hundred twenty-one billion, one hundred ninety-one million, one hundred thirty-eight thousand, five hundred fifty-four".