121820657554 has 8 divisors (see below), whose sum is σ = 182792666160. Its totient is φ = 60889768836.

The previous prime is 121820657503. The next prime is 121820657597. The reversal of 121820657554 is 455756028121.

121820657554 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10272564 + ... + 10284415.

It is an arithmetic number, because the mean of its divisors is an integer number (22849083270).

Almost surely, 2^121820657554 is an apocalyptic number.

121820657554 is a deficient number, since it is larger than the sum of its proper divisors (60972008606).

121820657554 is a wasteful number, since it uses less digits than its factorization.

121820657554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20559944.

The product of its (nonzero) digits is 672000, while the sum is 46.

The spelling of 121820657554 in words is "one hundred twenty-one billion, eight hundred twenty million, six hundred fifty-seven thousand, five hundred fifty-four".