21431103121 has 8 divisors (see below), whose sum is σ = 21934154880. Its totient is φ = 20928262992.

The previous prime is 21431103101. The next prime is 21431103163. The reversal of 21431103121 is 12130113412.

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 21431103121 - 2¹¹ = 21431101073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21431103101) 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, 162135 + ... + 262963.

It is an arithmetic number, because the mean of its divisors is an integer number (2741769360).

Almost surely, 2^21431103121 is an apocalyptic number.

It is an amenable number.

21431103121 is a deficient number, since it is larger than the sum of its proper divisors (503051759).

21431103121 is a wasteful number, since it uses less digits than its factorization.

21431103121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105815.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21431103121 its reverse (12130113412), we get a palindrome (33561216533).

The spelling of 21431103121 in words is "twenty-one billion, four hundred thirty-one million, one hundred three thousand, one hundred twenty-one".