21301031121 has 16 divisors (see below), whose sum is σ = 28630745088. Its totient is φ = 14086098000.

The previous prime is 21301031117. The next prime is 21301031149. The reversal of 21301031121 is 12113010312.

It is a happy number.

It is not a de Polignac number, because 21301031121 - 2² = 21301031117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21301031121.

It is not an unprimeable number, because it can be changed into a prime (21301031111) 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 15 ways as a sum of consecutive naturals, for example, 991920 + ... + 1013166.

It is an arithmetic number, because the mean of its divisors is an integer number (1789421568).

Almost surely, 2^21301031121 is an apocalyptic number.

It is an amenable number.

21301031121 is a deficient number, since it is larger than the sum of its proper divisors (7329713967).

21301031121 is a wasteful number, since it uses less digits than its factorization.

21301031121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23932.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21301031121 its reverse (12113010312), we get a palindrome (33414041433).

The spelling of 21301031121 in words is "twenty-one billion, three hundred one million, thirty-one thousand, one hundred twenty-one".