21301013121 has 4 divisors (see below), whose sum is σ = 28401350832. Its totient is φ = 14200675412.

The previous prime is 21301013119. The next prime is 21301013143. The reversal of 21301013121 is 12131010312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21301013121 - 2¹ = 21301013119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21301013121.

It is not an unprimeable number, because it can be changed into a prime (21301013101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3550168851 + ... + 3550168856.

It is an arithmetic number, because the mean of its divisors is an integer number (7100337708).

Almost surely, 2^21301013121 is an apocalyptic number.

It is an amenable number.

21301013121 is a deficient number, since it is larger than the sum of its proper divisors (7100337711).

21301013121 is an equidigital number, since it uses as much as digits as its factorization.

21301013121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7100337710.

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

Adding to 21301013121 its reverse (12131010312), we get a palindrome (33432023433).

The spelling of 21301013121 in words is "twenty-one billion, three hundred one million, thirteen thousand, one hundred twenty-one".