121541544421 has 8 divisors (see below), whose sum is σ = 140390233344. Its totient is φ = 103992765120.

The previous prime is 121541544409. The next prime is 121541544437. The reversal of 121541544421 is 124445145121.

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 121541544421 - 2⁵ = 121541544389 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 (121541544491) 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, 324977205 + ... + 324977578.

It is an arithmetic number, because the mean of its divisors is an integer number (17548779168).

Almost surely, 2^121541544421 is an apocalyptic number.

121541544421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121541544421 is a deficient number, since it is larger than the sum of its proper divisors (18848688923).

121541544421 is a wasteful number, since it uses less digits than its factorization.

121541544421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649954811.

The product of its digits is 25600, while the sum is 34.

Adding to 121541544421 its reverse (124445145121), we get a palindrome (245986689542).

The spelling of 121541544421 in words is "one hundred twenty-one billion, five hundred forty-one million, five hundred forty-four thousand, four hundred twenty-one".