21304131121 has 16 divisors (see below), whose sum is σ = 27600496000. Its totient is φ = 15968855808.

The previous prime is 21304131113. The next prime is 21304131131. The reversal of 21304131121 is 12113140312.

It is a cyclic number.

It is not a de Polignac number, because 21304131121 - 2³ = 21304131113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (21304131131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6159096 + ... + 6162553.

It is an arithmetic number, because the mean of its divisors is an integer number (1725031000).

Almost surely, 2^21304131121 is an apocalyptic number.

It is an amenable number.

21304131121 is a deficient number, since it is larger than the sum of its proper divisors (6296364879).

21304131121 is a wasteful number, since it uses less digits than its factorization.

21304131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12321688.

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

Adding to 21304131121 its reverse (12113140312), we get a palindrome (33417271433).

The spelling of 21304131121 in words is "twenty-one billion, three hundred four million, one hundred thirty-one thousand, one hundred twenty-one".