21013120101 has 4 divisors (see below), whose sum is σ = 28017493472. Its totient is φ = 14008746732.

The previous prime is 21013120099. The next prime is 21013120103. The reversal of 21013120101 is 10102131012.

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 an interprime number because it is at equal distance from previous prime (21013120099) and next prime (21013120103).

It is not a de Polignac number, because 21013120101 - 2¹ = 21013120099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013120103) 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, 3502186681 + ... + 3502186686.

It is an arithmetic number, because the mean of its divisors is an integer number (7004373368).

Almost surely, 2^21013120101 is an apocalyptic number.

It is an amenable number.

21013120101 is a deficient number, since it is larger than the sum of its proper divisors (7004373371).

21013120101 is an equidigital number, since it uses as much as digits as its factorization.

21013120101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7004373370.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21013120101 its reverse (10102131012), we get a palindrome (31115251113).

The spelling of 21013120101 in words is "twenty-one billion, thirteen million, one hundred twenty thousand, one hundred one".