20121344121 has 8 divisors (see below), whose sum is σ = 26835777760. Its totient is φ = 13410569952.

The previous prime is 20121344101. The next prime is 20121344171. The reversal of 20121344121 is 12144312102.

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

It is not a de Polignac number, because 20121344121 - 2⁹ = 20121343609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121344101) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 902011 + ... + 924048.

It is an arithmetic number, because the mean of its divisors is an integer number (3354472220).

Almost surely, 2^20121344121 is an apocalyptic number.

It is an amenable number.

20121344121 is a deficient number, since it is larger than the sum of its proper divisors (6714433639).

20121344121 is a wasteful number, since it uses less digits than its factorization.

20121344121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829735.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 20121344121 its reverse (12144312102), we get a palindrome (32265656223).

The spelling of 20121344121 in words is "twenty billion, one hundred twenty-one million, three hundred forty-four thousand, one hundred twenty-one".