21420102013 has 4 divisors (see below), whose sum is σ = 21421045440. Its totient is φ = 21419158588.

The previous prime is 21420101971. The next prime is 21420102059. The reversal of 21420102013 is 31020102412.

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 21420102013 - 2¹⁷ = 21419970941 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 (21420102083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 436795 + ... + 483352.

It is an arithmetic number, because the mean of its divisors is an integer number (5355261360).

Almost surely, 2^21420102013 is an apocalyptic number.

It is an amenable number.

21420102013 is a deficient number, since it is larger than the sum of its proper divisors (943427).

21420102013 is an equidigital number, since it uses as much as digits as its factorization.

21420102013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943426.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21420102013 its reverse (31020102412), we get a palindrome (52440204425).

The spelling of 21420102013 in words is "twenty-one billion, four hundred twenty million, one hundred two thousand, thirteen".