121550005421 has 8 divisors (see below), whose sum is σ = 131076193920. Its totient is φ = 112048986672.

The previous prime is 121550005417. The next prime is 121550005441. The reversal of 121550005421 is 124500055121.

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

It is a cyclic number.

It is not a de Polignac number, because 121550005421 - 2² = 121550005417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121550005441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6282401 + ... + 6301718.

It is an arithmetic number, because the mean of its divisors is an integer number (16384524240).

Almost surely, 2^121550005421 is an apocalyptic number.

It is an amenable number.

121550005421 is a deficient number, since it is larger than the sum of its proper divisors (9526188499).

121550005421 is a wasteful number, since it uses less digits than its factorization.

121550005421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12584875.

The product of its (nonzero) digits is 2000, while the sum is 26.

The spelling of 121550005421 in words is "one hundred twenty-one billion, five hundred fifty million, five thousand, four hundred twenty-one".