21013122013 has 16 divisors (see below), whose sum is σ = 22876148736. Its totient is φ = 19185710400.

The previous prime is 21013122007. The next prime is 21013122019. The reversal of 21013122013 is 31022131012.

It is an interprime number because it is at equal distance from previous prime (21013122007) and next prime (21013122019).

It is a cyclic number.

It is not a de Polignac number, because 21013122013 - 2³³ = 12423187421 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 (21013122019) 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, 1419870 + ... + 1434592.

It is an arithmetic number, because the mean of its divisors is an integer number (1429759296).

Almost surely, 2^21013122013 is an apocalyptic number.

It is an amenable number.

21013122013 is a deficient number, since it is larger than the sum of its proper divisors (1863026723).

21013122013 is a wasteful number, since it uses less digits than its factorization.

21013122013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15924.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21013122013 its reverse (31022131012), we get a palindrome (52035253025).

The spelling of 21013122013 in words is "twenty-one billion, thirteen million, one hundred twenty-two thousand, thirteen".